diff --git a/.gitea/workflows/hub-check.yml b/.gitea/workflows/hub-check.yml
index 0ef40ca..fd5b622 100644
--- a/.gitea/workflows/hub-check.yml
+++ b/.gitea/workflows/hub-check.yml
@@ -36,7 +36,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "20"
+          node-version: "24"
           cache: npm
           cache-dependency-path: hub/package-lock.json
 
@@ -112,36 +112,6 @@ jobs:
         env:
           DATABASE_URL: postgresql://paradigm:paradigm@127.0.0.1:5432/cph_hub_test
 
-      - name: Smoke health endpoint
-        run: |
-          PORT=8878 \
-          NODE_ENV=production \
-          DATABASE_URL=postgresql://paradigm:paradigm@127.0.0.1:5432/cph_hub_test \
-          ANTHROPIC_AUTH_TOKEN=smoke \
-          FEISHU_APP_ID=cli_smoke \
-          FEISHU_APP_SECRET=smoke_secret \
-          FEISHU_BOT_OPEN_ID=ou_smoke \
-          HOST=127.0.0.1 \
-          HUB_PROJECT_WORKSPACE_ROOT=/tmp/cph-hub-smoke-workspaces \
-          HUB_PUBLIC_BASE_URL=https://hub.example.test \
-          HUB_SESSION_SECRET=smoke-session-secret-with-at-least-32-bytes \
-          HUB_FEISHU_LISTENER_ENABLED=false \
-          npm start &
-          pid=$!
-          trap 'kill "$pid" 2>/dev/null || true' EXIT
-          for attempt in $(seq 1 30); do
-            if curl --fail --silent "http://127.0.0.1:8878/api/healthz" >/dev/null; then
-              exit 0
-            fi
-            if ! kill -0 "$pid" 2>/dev/null; then
-              echo "hub server exited before health check passed"
-              wait "$pid"
-              exit 1
-            fi
-            sleep 1
-          done
-          curl --fail --silent --show-error "http://127.0.0.1:8878/api/healthz" >/dev/null
-
       # Real-model tests are opt-in: set RUN_REAL_MODEL_TESTS=true and provide
       # OPENROUTER_API_KEY when a branch should hit live OpenRouter.
       - name: Run real-model integration tests (optional, needs secret)
diff --git a/AGENTS.md b/AGENTS.md
index 9a1f435..e66e942 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -24,6 +24,10 @@
 - 平台管理员只通过独立的 platform-owned 飞书应用与可撤销 Platform Session 认证,不复用
   客户 `User`/org membership;平台写操作与 append-only audit 同事务,break-glass 只走
   双因子的离线恢复流程(见 ADR-0023 / `Spec.System.PlatformAdministration`)。
+- 受控 alpha 暂采用一 Organization 一具名 systemd Silo:独立 database role/database、
+  service identity、workspace、keyring 与 Feishu/provider connection；进程必须由
+  `HUB_SILO_ORGANIZATION_ID` fail-closed 绑定唯一 org，平台后台不开放。共享 SaaS
+  控制面与 Docker adapter 后置(见 ADR-0025)。
 
 ## 纪律
 
diff --git a/docs/adr/0025-alpha-silo-deployment.md b/docs/adr/0025-alpha-silo-deployment.md
new file mode 100644
index 0000000..deb27c4
--- /dev/null
+++ b/docs/adr/0025-alpha-silo-deployment.md
@@ -0,0 +1,57 @@
+# ADR 0025: Alpha Uses Managed Single-Organization Silos
+
+## Status
+
+Accepted for the supervised alpha.
+
+## Context
+
+The shared SaaS control plane, durable cross-Organization admission scheduler,
+and customer administration SPA are not complete. Real customer data must not
+depend on partially migrated application-level tenant filtering merely to start
+the supervised alpha.
+
+## Decision
+
+Each alpha Organization runs as a separately named Silo deployment. A Silo has
+one Hub systemd unit and service identity, one logical PostgreSQL database and
+database role, one workspace root, one environment/session secret, one local
+master-key keyring, one Feishu Application Connection, and Organization-local
+Provider Connections. The process is pinned by `HUB_SILO_ORGANIZATION_ID` and
+refuses startup unless its database contains exactly that one active
+Organization.
+
+Application releases remain shared and versioned; customer state does not live
+inside a release directory. Host-console bootstrap, upgrade, backup, restore,
+and KEK rotation always name a Silo instance explicitly. The alpha exposes no
+platform administration surface. Operators provision and support Silos through
+the controlled host console and retain an external change record.
+
+The process-local trigger queue is not an accepted-work queue in the Silo
+alpha. A busy project or instance rejects new work explicitly. Each instance
+has checked-in application limits and explicit systemd CPU, memory, and process
+ceilings. Workspace filesystem quotas are a host provisioning prerequisite.
+
+This topology changes deployment, not the semantic tenant root:
+`Organization` remains the tenant root and every authorization, secret, audit,
+Project, Team, and Run remains Organization-scoped. A later pooled or bridge
+adapter may host multiple Organizations only after ADR-0022's durable admission
+and platform control requirements are implemented.
+
+## Consequences
+
+- Cross-Organization data access is prevented by database credentials and
+  process/filesystem identity in addition to application authorization.
+- Provisioning, migrations, backups, health, and upgrades are repeated per
+  Silo and therefore must be automated before tenant count grows materially.
+- Cross-Organization fairness is not applicable inside one Silo; host cgroup
+  ceilings prevent one Silo from exhausting the machine.
+- Database/workspace backups and the keyring/environment recovery copy are
+  produced to distinct protected destinations and must pass a restore drill.
+
+## Deferred
+
+- Shared platform identity and administration from ADR-0023.
+- Pooled durable fair scheduling from ADR-0022.
+- Customer org administration SPA and self-service onboarding.
+- Docker or Kubernetes as an alternative deployment adapter.
diff --git a/hub/.env.example b/hub/.env.example
index 001139c..3df1b33 100644
--- a/hub/.env.example
+++ b/hub/.env.example
@@ -18,18 +18,26 @@ DATABASE_URL="postgresql://paradigm:paradigm@127.0.0.1:5432/paradigm"
 # ANTHROPIC_DEFAULT_OPUS_MODEL="z-ai/glm-4.7"
 # ANTHROPIC_DEFAULT_HAIKU_MODEL="z-ai/glm-4.6"
 
-# Agent run policy (optional). Defaults to 25.
+# Alpha Silo safety limits. max turns may use its default; every other value is
+# mandatory in production and should be calibrated on the target host.
 # HUB_AGENT_MAX_TURNS=25
+HUB_AGENT_MAX_CONCURRENT_RUNS="1"
+HUB_AGENT_MAX_RUN_SECONDS="900"
+HUB_HTTP_BODY_LIMIT_BYTES="1048576"
+HUB_MAX_FILES_PER_MESSAGE="8"
+HUB_MAX_FILE_BYTES="26214400"
+HUB_HTTP_REQUESTS_PER_MINUTE="120"
+HUB_FEISHU_EVENTS_PER_MINUTE="120"
 
 # Persistent system-managed root for project workspaces. Production must use an
 # absolute path outside the deployment/release tree; install_service.sh defaults
 # to this path and rejects any overlap before installing the unit.
 HUB_PROJECT_WORKSPACE_ROOT="/var/lib/cph-hub/workspaces"
 
-# Feishu (lark) bot credentials.
-FEISHU_APP_ID=""
-FEISHU_APP_SECRET=""
-FEISHU_BOT_OPEN_ID=""
+# This process is pinned to exactly one Organization. Feishu credentials are
+# resolved from that Organization's encrypted ACTIVE connection.
+HUB_SILO_ORGANIZATION_ID=""
+HUB_SYSTEMD_UNIT="cph-hub-example.service"
 
 # Absolute path to the `cph` binary (ADR-0016). Production preflight requires
 # the file to be executable and `cph --version` to succeed.
diff --git a/hub/deploy/README.md b/hub/deploy/README.md
index 912d823..16fcf2d 100644
--- a/hub/deploy/README.md
+++ b/hub/deploy/README.md
@@ -1,101 +1,151 @@
-# Hub service installation
+# Alpha Silo service installation
 
-The initial production target is a supported Linux host with systemd,
-PostgreSQL, Node.js 20 or newer, `pg_isready`, `runuser`, `setpriv`, bubblewrap,
-`socat` and `cph`. The Hub runs as the dedicated non-login `cph-hub` user; do not
-create or run the unit as root.
+The supervised alpha runs one Organization per named Silo. The supported host
+has systemd, PostgreSQL, Node.js 24+, `pg_isready`, `runuser`, `setpriv`,
+bubblewrap, `socat`, `pg_dump`, `tar`, `sha256sum`, and a compatible `cph`.
 
-Build or deploy the Hub under `/srv/curriculum-project-hub`, then run:
+Each Silo needs its own logical database/role, instance id, service user,
+environment, keyring, workspace, port, domain, and host filesystem quota.
+Application code lives in immutable versioned directories under
+`/srv/curriculum-project-hub/releases/`; releases contain no customer state.
+
+## Install an instance
 
 ```sh
 sudo BASE=/srv/curriculum-project-hub \
-  HUB_DIR=/srv/curriculum-project-hub/hub \
-  bash /srv/curriculum-project-hub/hub/deploy/install_service.sh
+  HUB_DIR=/srv/curriculum-project-hub/releases/<release-id>/hub \
+  INSTANCE_ID=org-a \
+  PORT=8788 \
+  MEMORY_MAX=16G CPU_QUOTA=400% TASKS_MAX=512 \
+  bash /srv/curriculum-project-hub/releases/<release-id>/hub/deploy/install_service.sh
 ```
 
-On a clean host the first invocation creates
-`/srv/curriculum-project-hub/.secrets/platform.env` and a random root-owned
-`secret-keyring.json`, then exits with status 78. Copy the keyring to a
-separately protected recovery location before continuing; it must not live only
-on this host or in the ordinary database/workspace backup. Fill every required
-environment blank, set `CPH_BIN` to an executable compatible `cph`, keep both
-source files root-only at mode `0600`, and run the same command again. No
-systemd unit is installed until configuration,
-paths, Node, bubblewrap, `socat`, `cph --version`, PostgreSQL connectivity and directory
-ownership all pass preflight.
-
-The service account cannot read the keyring source. The installed unit uses
-systemd `LoadCredential` to materialize a read-only `cph-secret-keyring` for the
-running service. Hub refuses production startup if this credential is missing,
-malformed, or does not contain its declared active key. Provider credentials
-are configured through the Organization admin connection API, never through
-process-global `ANTHROPIC_*` variables; preflight rejects those legacy settings.
-
-Rotate the local KEK only from the controlled host console. The command first
-atomically adds a new active key while retaining every previous key, then
-authenticates and rewraps every stored Provider and Feishu Application DEK,
-writes redacted org audit events, and verifies the complete set again:
+The first invocation creates root-owned `0600` files below
+`/srv/curriculum-project-hub/.secrets/org-a/` and exits 78. Copy the keyring to
+a separately protected recovery destination and fill every blank in
+`platform.env`. Before rerunning the installer, migrate the empty Silo database:
 
 ```sh
 sudo bash -c '
   set -euo pipefail
-  systemctl stop cph-hub.service
-  set -a
-  . /srv/curriculum-project-hub/.secrets/platform.env
-  set +a
-  node /srv/curriculum-project-hub/hub/dist/deployment/rotate-secret-kek.js \
-    --keyring-file /srv/curriculum-project-hub/.secrets/secret-keyring.json
-  systemctl start cph-hub.service
+  set -a; . /srv/curriculum-project-hub/.secrets/org-a/platform.env; set +a
+  node /srv/curriculum-project-hub/releases/<release-id>/hub/node_modules/prisma/build/index.js \
+    migrate deploy \
+    --schema /srv/curriculum-project-hub/releases/<release-id>/hub/prisma/schema.prisma
 '
 ```
 
-The CLI refuses to rotate while `cph-hub.service` is active; stopping the only
-writer prevents a concurrent BYOK version from being appended under the old
-in-memory keyring. A PostgreSQL transaction advisory lock excludes a second
-rotation and is released automatically if the CLI or host crashes. The
-operation is therefore rerunnable after interruption: old and new keys remain
-in the atomically replaced keyring, so partially rewrapped rows stay
-decryptable. It also refuses success while any envelope still names a
-non-active KEK. Back up the updated keyring to the separate recovery location
-and complete a restore preflight before considering old-key retirement. The
-pilot deliberately does not auto-delete previous keys.
+Then rerun the installer so it can complete preflight and install the stopped
+unit. Resource numbers above are examples, not defaults; the operator must set
+measured ceilings explicitly.
 
-The deployment path also runs `npm run audit:production` from the locked clean
-install before building or restarting the service. A current high or critical
-production advisory therefore blocks deployment instead of becoming a warning
-buried in CI output.
+The installer refuses overlapping release/persistent paths, root service users,
+missing Node/cph/PostgreSQL/bubblewrap prerequisites, invalid credentials, and
+unreachable database roles. The installed unit is `cph-hub-org-a.service` and
+uses systemd `LoadCredential`; the service user cannot read the source keyring.
 
-An existing service account is accepted only when its primary group, home and
-non-login shell match the requested configuration and it has no supplementary
-groups. After provisioning, the installer executes path-access, built Hub,
-Prisma, an authenticated database query, `cph`, `socat` and bubblewrap namespace probes
-as that account with `no_new_privs` set. Inaccessible parents, UID-specific
-database/network policy, or a host that forbids unprivileged user namespaces
-therefore fail before unit installation.
-
-The default persistent layout is deliberately outside every source/release
-tree:
+Default state paths are:
 
 ```text
-/var/lib/cph-hub/home
-/var/lib/cph-hub/state
-/var/lib/cph-hub/workspaces
-/var/cache/cph-hub
+/var/lib/cph-hub/org-a/home
+/var/lib/cph-hub/org-a/state
+/var/lib/cph-hub/org-a/workspaces
+/var/cache/cph-hub/org-a
 ```
 
-Custom paths are supported with `SERVICE_HOME`, `STATE_DIR`, `CACHE_DIR` and
-`WORKSPACE_ROOT`, but all must be absolute. The installer rejects any persistent
-path that is equal to, above, or below `BASE`; this keeps rsync, release
-switching, rollback and pruning unable to traverse customer workspaces. Set the
-same custom workspace in `HUB_PROJECT_WORKSPACE_ROOT` inside `platform.env`.
+## Bootstrap the only Organization
 
-After a successful installation:
+Prepare a root-owned `0600` JSON file containing
+`organization`, `owner`, `feishu`, `provider`, and optionally `teams`. Secrets
+never appear in command-line arguments.
+
+```json
+{
+  "organization": { "id": "org_a", "slug": "org-a", "name": "Org A" },
+  "owner": { "openId": "ou_owner", "displayName": "Owner" },
+  "feishu": {
+    "appId": "cli_xxx",
+    "appSecret": "...",
+    "botOpenId": "ou_bot"
+  },
+  "provider": {
+    "providerId": "openrouter",
+    "baseUrl": "https://openrouter.ai/api",
+    "authToken": "..."
+  },
+  "teams": [{ "slug": "teachers", "name": "Teachers" }]
+}
+```
 
 ```sh
-sudo systemctl start cph-hub.service
-sudo systemctl status cph-hub.service
+sudo bash -c '
+  set -euo pipefail
+  set -a; . /srv/curriculum-project-hub/.secrets/org-a/platform.env; set +a
+  node /srv/curriculum-project-hub/releases/<release-id>/hub/dist/deployment/bootstrap-silo-cli.js \
+    --config-file /root/org-a-bootstrap.json \
+    --keyring-file /srv/curriculum-project-hub/.secrets/org-a/secret-keyring.json
+'
 ```
 
-`HOST` and `PORT` in `platform.env` are passed to the real HTTP listener. The
-default `127.0.0.1:8788` expects a local TLS reverse proxy; the public OAuth URL
-must be an HTTPS `HUB_PUBLIC_BASE_URL`.
+Bootstrap encrypts and activates both connection records and is rerunnable when
+provider configuration fails after Organization creation. Hub startup refuses
+to become healthy unless the sole Organization, active provider, active Feishu
+application, and Feishu listener are ready. Delete the bootstrap input after
+the recovery copy is current. Production has no process-global Feishu/provider
+credential fallback.
+
+## Start and rotate
+
+```sh
+sudo systemctl start cph-hub-org-a.service
+sudo systemctl status cph-hub-org-a.service
+```
+
+KEK rotation requires the named unit to be stopped. Source its instance env so
+`HUB_SYSTEMD_UNIT` and `DATABASE_URL` identify the same Silo:
+
+```sh
+sudo bash -c '
+  set -euo pipefail
+  systemctl stop cph-hub-org-a.service
+  set -a; . /srv/curriculum-project-hub/.secrets/org-a/platform.env; set +a
+  node /srv/curriculum-project-hub/hub/dist/deployment/rotate-secret-kek.js \
+    --keyring-file /srv/curriculum-project-hub/.secrets/org-a/secret-keyring.json
+  systemctl start cph-hub-org-a.service
+'
+```
+
+## Backup and restore drill (recommended after the demo is running)
+
+Stop the unit and run `backup_silo.sh` with distinct root-owned destinations:
+
+```sh
+sudo INSTANCE_ID=org-a \
+  ENV_FILE=/srv/curriculum-project-hub/.secrets/org-a/platform.env \
+  KEYRING_FILE=/srv/curriculum-project-hub/.secrets/org-a/secret-keyring.json \
+  BUSINESS_BACKUP_DIR=/backup/business \
+  RECOVERY_BACKUP_DIR=/separate-recovery \
+  bash hub/deploy/backup_silo.sh
+```
+
+The business set contains the PostgreSQL custom dump and workspace archive. The
+separate recovery set contains the keyring and environment. Both include
+checksums; neither destination may be the live host's only disk.
+
+Restore into a separate drill database/workspace, verify checksums, then run:
+
+```sh
+set -a; . /path/to/restored/platform.env; set +a
+node hub/dist/deployment/restore-preflight.js \
+  --keyring-file /path/to/restored/secret-keyring.json
+```
+
+Traffic stays disabled until the sole Organization and every Feishu/provider
+envelope authenticate, the workspace exists, and an end-to-end test run passes.
+
+For the first supervised demo, install → bootstrap → start → health check is the
+deployment gate. A completed off-host restore drill is an Alpha hardening item,
+not a prerequisite for bringing up that first controlled Silo.
+
+The default bind remains loopback; expose it only through a TLS reverse proxy.
+The platform admin surface is not part of the alpha and must not be exposed.
diff --git a/hub/deploy/backup_silo.sh b/hub/deploy/backup_silo.sh
new file mode 100755
index 0000000..66d3847
--- /dev/null
+++ b/hub/deploy/backup_silo.sh
@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+# Create a stopped-instance backup. Business data and recovery credentials are
+# deliberately written to different root-owned destinations.
+set -euo pipefail
+
+INSTANCE_ID="${INSTANCE_ID:?INSTANCE_ID required}"
+ENV_FILE="${ENV_FILE:?ENV_FILE required}"
+KEYRING_FILE="${KEYRING_FILE:?KEYRING_FILE required}"
+BUSINESS_BACKUP_DIR="${BUSINESS_BACKUP_DIR:?BUSINESS_BACKUP_DIR required}"
+RECOVERY_BACKUP_DIR="${RECOVERY_BACKUP_DIR:?RECOVERY_BACKUP_DIR required}"
+SERVICE_UNIT="cph-hub-$INSTANCE_ID.service"
+
+[ "$(id -u)" -eq 0 ] || { echo "backup must run as root" >&2; exit 1; }
+umask 077
+
+validate_root_secret_file() {
+  local label="$1" path="$2" metadata
+  [[ "$path" = /* ]] || { echo "$label must be an absolute path" >&2; exit 1; }
+  [ ! -L "$path" ] || { echo "$label must not be a symlink: $path" >&2; exit 1; }
+  [ -f "$path" ] || { echo "$label must be a regular file: $path" >&2; exit 1; }
+  metadata="$(stat -c '%u:%g:%a' -- "$path")"
+  [ "$metadata" = "0:0:600" ] || {
+    echo "$label must be root:root mode 0600; found $metadata" >&2
+    exit 1
+  }
+}
+
+validate_root_secret_file "ENV_FILE" "$ENV_FILE"
+validate_root_secret_file "KEYRING_FILE" "$KEYRING_FILE"
+state="$(systemctl show --property=ActiveState --value "$SERVICE_UNIT")"
+case "$state" in inactive|failed) ;; *) echo "$SERVICE_UNIT must be stopped; state=$state" >&2; exit 1;; esac
+
+set -a
+# shellcheck disable=SC1090
+. "$ENV_FILE"
+set +a
+: "${DATABASE_URL:?DATABASE_URL missing from ENV_FILE}"
+: "${HUB_PROJECT_WORKSPACE_ROOT:?HUB_PROJECT_WORKSPACE_ROOT missing from ENV_FILE}"
+[ -d "$HUB_PROJECT_WORKSPACE_ROOT" ] || { echo "workspace root missing" >&2; exit 1; }
+
+install -d -o root -g root -m 0700 "$BUSINESS_BACKUP_DIR" "$RECOVERY_BACKUP_DIR"
+business_root="$(realpath -m "$BUSINESS_BACKUP_DIR")"
+recovery_root="$(realpath -m "$RECOVERY_BACKUP_DIR")"
+workspace_root="$(realpath -m "$HUB_PROJECT_WORKSPACE_ROOT")"
+secret_root="$(realpath -m "$(dirname "$KEYRING_FILE")")"
+paths_overlap() {
+  local left="$1" right="$2"
+  [ "$left" = "$right" ] || [[ "$left/" == "$right/"* ]] || [[ "$right/" == "$left/"* ]]
+}
+for pair in \
+  "$business_root|$recovery_root" \
+  "$business_root|$workspace_root" \
+  "$recovery_root|$workspace_root" \
+  "$recovery_root|$secret_root"; do
+  left="${pair%%|*}"; right="${pair#*|}"
+  if paths_overlap "$left" "$right"; then
+    echo "backup destinations must not overlap each other or live state: $left <> $right" >&2
+    exit 1
+  fi
+done
+stamp="$(date -u +%Y%m%dT%H%M%SZ)"
+business="$business_root/$INSTANCE_ID-$stamp"
+recovery="$recovery_root/$INSTANCE_ID-$stamp"
+install -d -o root -g root -m 0700 "$business" "$recovery"
+
+pg_dump --format=custom --file="$business/database.dump" "$DATABASE_URL"
+tar --create --file="$business/workspaces.tar" --directory="$HUB_PROJECT_WORKSPACE_ROOT" .
+cp --preserve=mode,ownership,timestamps "$KEYRING_FILE" "$recovery/secret-keyring.json"
+cp --preserve=mode,ownership,timestamps "$ENV_FILE" "$recovery/platform.env"
+chmod 0600 "$recovery/secret-keyring.json" "$recovery/platform.env"
+
+(
+  cd "$business"
+  sha256sum database.dump workspaces.tar > SHA256SUMS
+)
+(
+  cd "$recovery"
+  sha256sum secret-keyring.json platform.env > SHA256SUMS
+)
+echo "business backup: $business"
+echo "separate recovery backup: $recovery"
diff --git a/hub/deploy/cph-hub.service b/hub/deploy/cph-hub.service
index 96a7c79..eda8bac 100644
--- a/hub/deploy/cph-hub.service
+++ b/hub/deploy/cph-hub.service
@@ -1,5 +1,5 @@
 [Unit]
-Description=Curriculum Project Hub (Feishu agent + cph)
+Description=Curriculum Project Hub Silo (__INSTANCE_ID__)
 After=network-online.target postgresql.service
 Wants=network-online.target
 # ADR-0018: refuse to start when the configured OS sandbox binary disappears
@@ -28,6 +28,10 @@ ExecStartPre=__NODE_BIN__ __HUB_DIR__/node_modules/prisma/build/index.js migrate
 ExecStart=__NODE_BIN__ __HUB_DIR__/dist/server.js
 Restart=on-failure
 RestartSec=5
+MemoryMax=__MEMORY_MAX__
+CPUQuota=__CPU_QUOTA__
+TasksMax=__TASKS_MAX__
+OOMPolicy=stop
 # Graceful shutdown: lark ws close + in-flight runs.
 KillSignal=SIGTERM
 TimeoutStopSec=30
diff --git a/hub/deploy/deploy_platform.sh b/hub/deploy/deploy_platform.sh
index 86ba95f..cc5834d 100755
--- a/hub/deploy/deploy_platform.sh
+++ b/hub/deploy/deploy_platform.sh
@@ -5,51 +5,75 @@
 #   PLATFORM_DEPLOY_HOST     required
 #   PLATFORM_DEPLOY_SSH_KEY  required (private key for the deploy user)
 #   PLATFORM_DEPLOY_USER     optional, defaults to deploy
-#   PLATFORM_DEPLOY_PORT     optional, defaults to 22
+#   PLATFORM_DEPLOY_PORT     optional SSH port, defaults to 22
+#   PLATFORM_DEPLOY_HUB_PORT required Silo listener port
 #   PLATFORM_DEPLOY_BASE     optional, defaults to /srv/curriculum-project-hub
+#   PLATFORM_DEPLOY_RELEASE  optional immutable release id, defaults to git HEAD
+#   PLATFORM_DEPLOY_INSTANCE required, Silo instance id
+#   PLATFORM_DEPLOY_MEMORY_MAX / CPU_QUOTA / TASKS_MAX required ceilings
 #   PLATFORM_DEPLOY_HEALTH_URL optional, defaults to http://127.0.0.1:8788/api/healthz
-# The target host must have Node.js 20+, npm, rsync, PostgreSQL client tools
+# The target host must have Node.js 24+, npm, rsync, PostgreSQL client tools
 # (`pg_isready`), systemd, bubblewrap (`bwrap`) and `socat` (for the ADR-0018 agent sandbox),
 # and a compatible `cph` binary named by platform.env. The service installer
 # provisions the dedicated non-root identity and persistent directories.
 # Use a dedicated `deploy` user that has passwordless sudo for systemctl and
-# writing /etc/systemd/system/cph-hub.service through deploy/install_service.sh.
+# writing the named /etc/systemd/system/cph-hub-<instance>.service through the installer.
 set -euo pipefail
 
 HOST="${PLATFORM_DEPLOY_HOST:?PLATFORM_DEPLOY_HOST required}"
 SSH_KEY="${PLATFORM_DEPLOY_SSH_KEY:?PLATFORM_DEPLOY_SSH_KEY required}"
 DEPLOY_USER="${PLATFORM_DEPLOY_USER:-deploy}"
 PORT="${PLATFORM_DEPLOY_PORT:-22}"
+HUB_PORT="${PLATFORM_DEPLOY_HUB_PORT:?PLATFORM_DEPLOY_HUB_PORT required}"
 BASE="${PLATFORM_DEPLOY_BASE:-/srv/curriculum-project-hub}"
-HEALTH_URL="${PLATFORM_DEPLOY_HEALTH_URL:-http://127.0.0.1:8788/api/healthz}"
-HUB_DIR="$BASE/hub"
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+RELEASE_ID="${PLATFORM_DEPLOY_RELEASE:-$(git -C "$REPO_ROOT" rev-parse --verify HEAD)}"
+[[ "$RELEASE_ID" =~ ^[A-Za-z0-9._-]+$ ]] || { echo "invalid PLATFORM_DEPLOY_RELEASE" >&2; exit 1; }
+INSTANCE_ID="${PLATFORM_DEPLOY_INSTANCE:?PLATFORM_DEPLOY_INSTANCE required}"
+SERVICE_UNIT="cph-hub-$INSTANCE_ID.service"
+MEMORY_MAX="${PLATFORM_DEPLOY_MEMORY_MAX:?PLATFORM_DEPLOY_MEMORY_MAX required}"
+CPU_QUOTA="${PLATFORM_DEPLOY_CPU_QUOTA:?PLATFORM_DEPLOY_CPU_QUOTA required}"
+TASKS_MAX="${PLATFORM_DEPLOY_TASKS_MAX:?PLATFORM_DEPLOY_TASKS_MAX required}"
+HEALTH_URL="${PLATFORM_DEPLOY_HEALTH_URL:-http://127.0.0.1:$HUB_PORT/api/healthz}"
+HUB_DIR="$BASE/releases/$RELEASE_ID/hub"
+RELEASE_DIR="$BASE/releases/$RELEASE_ID"
 
 SSH_OPTS=(-i "$SSH_KEY" -p "$PORT" -o StrictHostKeyChecking=accept-new)
 
-ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "mkdir -p '$HUB_DIR'"
+release_ready=false
+if ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "test -f '$RELEASE_DIR/.complete'"; then
+  release_ready=true
+elif ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "test -e '$RELEASE_DIR'"; then
+  echo "incomplete release already exists: $RELEASE_DIR" >&2
+  exit 1
+else
+  ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "mkdir -p '$HUB_DIR'"
+fi
 
-# 1. Rsync the hub/ directory (exclude node_modules/dist, they rebuild on host).
-rsync -az --delete \
-  --exclude node_modules --exclude dist --exclude .env \
-  -e "ssh ${SSH_OPTS[*]}" \
-  "$REPO_ROOT/hub/" "$DEPLOY_USER@$HOST:$HUB_DIR/"
+if [ "$release_ready" = false ]; then
+  # 1. Populate a new release directory. A completed release is never mutated.
+  rsync -az --delete \
+    --exclude node_modules --exclude dist --exclude .env \
+    -e "ssh ${SSH_OPTS[*]}" \
+    "$REPO_ROOT/hub/" "$DEPLOY_USER@$HOST:$HUB_DIR/"
 
-# 2. Install deps, prove the production dependency tree, then build on the host.
-ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "cd '$HUB_DIR' && npm ci && npm run audit:production && npm run build"
+  # 2. Install deps, audit and build, then atomically mark the release complete.
+  ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" \
+    "cd '$HUB_DIR' && npm ci && npm run audit:production && npm run build && touch '$RELEASE_DIR/.complete'"
+fi
 
 # 3. Ensure the service is installed (idempotent), then restart.
 ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "
   set -euo pipefail
   if [ \"\$(id -u)\" = \"0\" ]; then
-    BASE='$BASE' HUB_DIR='$HUB_DIR' bash '$HUB_DIR/deploy/install_service.sh'
-    systemctl restart cph-hub.service
-    systemctl is-active --quiet cph-hub.service
+    BASE='$BASE' HUB_DIR='$HUB_DIR' INSTANCE_ID='$INSTANCE_ID' PORT='$HUB_PORT' MEMORY_MAX='$MEMORY_MAX' CPU_QUOTA='$CPU_QUOTA' TASKS_MAX='$TASKS_MAX' bash '$HUB_DIR/deploy/install_service.sh'
+    systemctl restart '$SERVICE_UNIT'
+    systemctl is-active --quiet '$SERVICE_UNIT'
   else
-    sudo -n BASE='$BASE' HUB_DIR='$HUB_DIR' bash '$HUB_DIR/deploy/install_service.sh'
-    sudo -n systemctl restart cph-hub.service
-    sudo -n systemctl is-active --quiet cph-hub.service
+    sudo -n BASE='$BASE' HUB_DIR='$HUB_DIR' INSTANCE_ID='$INSTANCE_ID' PORT='$HUB_PORT' MEMORY_MAX='$MEMORY_MAX' CPU_QUOTA='$CPU_QUOTA' TASKS_MAX='$TASKS_MAX' bash '$HUB_DIR/deploy/install_service.sh'
+    sudo -n systemctl restart '$SERVICE_UNIT'
+    sudo -n systemctl is-active --quiet '$SERVICE_UNIT'
   fi
   for attempt in \$(seq 1 30); do
     if curl --fail --silent '$HEALTH_URL' >/dev/null 2>&1; then
diff --git a/hub/deploy/install_service.sh b/hub/deploy/install_service.sh
index 142bc4d..0defa64 100755
--- a/hub/deploy/install_service.sh
+++ b/hub/deploy/install_service.sh
@@ -12,16 +12,25 @@ set -euo pipefail
 
 BASE="${BASE:-/srv/curriculum-project-hub}"
 HUB_DIR="${HUB_DIR:-$BASE/hub}"
-SERVICE_USER="${SERVICE_USER:-cph-hub}"
+INSTANCE_ID="${INSTANCE_ID:?INSTANCE_ID is required (lowercase letters, digits, hyphens)}"
+if [[ ! "$INSTANCE_ID" =~ ^[a-z0-9]([a-z0-9-]{0,22}[a-z0-9])?$ ]]; then
+  echo "[install] error: invalid INSTANCE_ID: $INSTANCE_ID" >&2
+  exit 1
+fi
+SERVICE_UNIT="cph-hub-$INSTANCE_ID.service"
+SERVICE_USER="${SERVICE_USER:-cph-$INSTANCE_ID}"
 SERVICE_GROUP="${SERVICE_GROUP:-$SERVICE_USER}"
-SERVICE_HOME="${SERVICE_HOME:-/var/lib/cph-hub/home}"
-STATE_DIR="${STATE_DIR:-/var/lib/cph-hub/state}"
-CACHE_DIR="${CACHE_DIR:-/var/cache/cph-hub}"
-WORKSPACE_ROOT="${WORKSPACE_ROOT:-/var/lib/cph-hub/workspaces}"
+SERVICE_HOME="${SERVICE_HOME:-/var/lib/cph-hub/$INSTANCE_ID/home}"
+STATE_DIR="${STATE_DIR:-/var/lib/cph-hub/$INSTANCE_ID/state}"
+CACHE_DIR="${CACHE_DIR:-/var/cache/cph-hub/$INSTANCE_ID}"
+WORKSPACE_ROOT="${WORKSPACE_ROOT:-/var/lib/cph-hub/$INSTANCE_ID/workspaces}"
 HOST="${HOST:-127.0.0.1}"
-PORT="${PORT:-8788}"
-ENV_FILE="${ENV_FILE:-$BASE/.secrets/platform.env}"
-KEYRING_FILE="${KEYRING_FILE:-$BASE/.secrets/secret-keyring.json}"
+PORT="${PORT:?PORT is required and must be unique on the host}"
+ENV_FILE="${ENV_FILE:-$BASE/.secrets/$INSTANCE_ID/platform.env}"
+KEYRING_FILE="${KEYRING_FILE:-$BASE/.secrets/$INSTANCE_ID/secret-keyring.json}"
+MEMORY_MAX="${MEMORY_MAX:?MEMORY_MAX is required, for example 16G}"
+CPU_QUOTA="${CPU_QUOTA:?CPU_QUOTA is required, for example 400%}"
+TASKS_MAX="${TASKS_MAX:?TASKS_MAX is required, for example 512}"
 SYSTEMD_UNIT_DIR="${SYSTEMD_UNIT_DIR:-/etc/systemd/system}"
 NODE_BIN="${NODE_BIN:-$(command -v node || true)}"
 BWRAP_BIN="${BWRAP_BIN:-$(command -v bwrap || true)}"
@@ -108,6 +117,9 @@ for pair in \
   "RUNTIME_PATH:$RUNTIME_PATH"; do
   require_safe_unit_value "${pair%%:*}" "${pair#*:}"
 done
+[[ "$MEMORY_MAX" =~ ^[1-9][0-9]*[KMGT]$ ]] || fail "MEMORY_MAX must be a systemd byte size such as 16G"
+[[ "$CPU_QUOTA" =~ ^[1-9][0-9]*%$ ]] || fail "CPU_QUOTA must be a positive percentage such as 400%"
+[[ "$TASKS_MAX" =~ ^[1-9][0-9]*$ ]] || fail "TASKS_MAX must be a positive integer"
 
 KEYRING_CREATED=false
 if [ -L "$KEYRING_FILE" ]; then
@@ -146,9 +158,8 @@ if [ ! -e "$ENV_FILE" ]; then
 # rerunning install_service.sh; failed preflight never installs the unit.
 NODE_ENV=production
 DATABASE_URL=
-FEISHU_APP_ID=
-FEISHU_APP_SECRET=
-FEISHU_BOT_OPEN_ID=
+HUB_SILO_ORGANIZATION_ID=
+HUB_SYSTEMD_UNIT=$SERVICE_UNIT
 CPH_BIN=$CPH_BIN_DEFAULT
 HOST=$HOST
 PORT=$PORT
@@ -156,6 +167,13 @@ HUB_PROJECT_WORKSPACE_ROOT=$WORKSPACE_ROOT
 HUB_PUBLIC_BASE_URL=
 HUB_SESSION_SECRET=
 HUB_AGENT_MAX_TURNS=25
+HUB_AGENT_MAX_CONCURRENT_RUNS=
+HUB_AGENT_MAX_RUN_SECONDS=
+HUB_HTTP_BODY_LIMIT_BYTES=
+HUB_MAX_FILES_PER_MESSAGE=
+HUB_MAX_FILE_BYTES=
+HUB_HTTP_REQUESTS_PER_MINUTE=
+HUB_FEISHU_EVENTS_PER_MINUTE=
 HUB_FEISHU_LISTENER_ENABLED=true
 CPH_SANDBOX_EXTRA_DENY_READ=$ENV_FILE:$KEYRING_FILE
 EOF
@@ -185,6 +203,7 @@ PREFLIGHT_ARGS=(
   --state-dir "$STATE_DIR"
   --cache-dir "$CACHE_DIR"
   --workspace-root "$WORKSPACE_ROOT"
+  --service-unit "$SERVICE_UNIT"
   --bwrap-bin "$BWRAP_BIN"
   --socat-bin "$SOCAT_BIN"
   --pg-isready-bin "$PG_ISREADY_BIN"
@@ -267,7 +286,7 @@ provision_directory "$WORKSPACE_ROOT"
 # the unit. This catches symlink or ownership changes between the two phases.
 "${PREFLIGHT_ARGS[@]}" --service-uid "$SERVICE_UID" --service-gid "$SERVICE_GID"
 
-UNIT="$SYSTEMD_UNIT_DIR/cph-hub.service"
+UNIT="$SYSTEMD_UNIT_DIR/$SERVICE_UNIT"
 install -d -o root -g root -m 0755 "$SYSTEMD_UNIT_DIR"
 TMP_UNIT="$(mktemp)"
 trap 'rm -f "$TMP_UNIT"' EXIT
@@ -285,11 +304,15 @@ sed \
   -e "s|__BWRAP_BIN__|$BWRAP_BIN|g" \
   -e "s|__SOCAT_BIN__|$SOCAT_BIN|g" \
   -e "s|__RUNTIME_PATH__|$RUNTIME_PATH|g" \
+  -e "s|__INSTANCE_ID__|$INSTANCE_ID|g" \
+  -e "s|__MEMORY_MAX__|$MEMORY_MAX|g" \
+  -e "s|__CPU_QUOTA__|$CPU_QUOTA|g" \
+  -e "s|__TASKS_MAX__|$TASKS_MAX|g" \
   "$SCRIPT_DIR/cph-hub.service" >"$TMP_UNIT"
 install -o root -g root -m 0644 "$TMP_UNIT" "$UNIT"
 
 systemctl daemon-reload
-systemctl enable cph-hub.service
-echo "[install] installed cph-hub.service for $SERVICE_USER:$SERVICE_GROUP"
+systemctl enable "$SERVICE_UNIT"
+echo "[install] installed $SERVICE_UNIT for $SERVICE_USER:$SERVICE_GROUP"
 echo "[install] home=$SERVICE_HOME state=$STATE_DIR cache=$CACHE_DIR workspaces=$WORKSPACE_ROOT"
-echo "[install] start with: systemctl start cph-hub.service"
+echo "[install] start with: systemctl start $SERVICE_UNIT"
diff --git a/hub/package-lock.json b/hub/package-lock.json
index f5f8104..00f685c 100644
--- a/hub/package-lock.json
+++ b/hub/package-lock.json
@@ -24,7 +24,7 @@
         "vitest": "^4.1.10"
       },
       "engines": {
-        "node": ">=20"
+        "node": ">=24"
       }
     },
     "node_modules/@ai-sdk/gateway": {
diff --git a/hub/package.json b/hub/package.json
index bdaf067..08c4eee 100644
--- a/hub/package.json
+++ b/hub/package.json
@@ -4,7 +4,7 @@
   "private": true,
   "type": "module",
   "engines": {
-    "node": ">=20"
+    "node": ">=24"
   },
   "dependencies": {
     "@anthropic-ai/claude-agent-sdk": "^0.3.202",
@@ -38,6 +38,8 @@
     "prisma:validate": "DATABASE_URL=${DATABASE_URL:-postgresql://stub:stub@127.0.0.1:5432/stub} prisma validate --schema prisma/schema.prisma",
     "prisma:migrate": "DATABASE_URL=${DATABASE_URL:-postgresql://paradigm:paradigm@127.0.0.1:5432/paradigm} prisma migrate deploy --schema prisma/schema.prisma",
     "secrets:rotate-kek": "node dist/deployment/rotate-secret-kek.js",
+    "silo:bootstrap": "node dist/deployment/bootstrap-silo-cli.js",
+    "silo:restore-preflight": "node dist/deployment/restore-preflight.js",
     "deploy": "bash deploy/deploy_platform.sh",
     "test": "vitest run",
     "test:watch": "vitest"
diff --git a/hub/prisma/migrations/20260710231000_feishu_user_identity_namespace/migration.sql b/hub/prisma/migrations/20260710231000_feishu_user_identity_namespace/migration.sql
new file mode 100644
index 0000000..8c051b4
--- /dev/null
+++ b/hub/prisma/migrations/20260710231000_feishu_user_identity_namespace/migration.sql
@@ -0,0 +1,30 @@
+-- ADR-0024 / Issue 44: Feishu provider-local user identifiers are scoped by
+-- the Organization's stable customer application connection. Existing legacy
+-- User.feishuOpenId values are deliberately not guessed into this table.
+
+CREATE TABLE "FeishuUserIdentity" (
+    "id" TEXT NOT NULL,
+    "connectionId" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "openId" TEXT NOT NULL,
+    "unionId" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+    CONSTRAINT "FeishuUserIdentity_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "FeishuUserIdentity_connectionId_openId_key"
+  ON "FeishuUserIdentity"("connectionId", "openId");
+CREATE UNIQUE INDEX "FeishuUserIdentity_connectionId_unionId_key"
+  ON "FeishuUserIdentity"("connectionId", "unionId");
+CREATE UNIQUE INDEX "FeishuUserIdentity_connectionId_userId_key"
+  ON "FeishuUserIdentity"("connectionId", "userId");
+CREATE INDEX "FeishuUserIdentity_userId_idx"
+  ON "FeishuUserIdentity"("userId");
+
+ALTER TABLE "FeishuUserIdentity"
+  ADD CONSTRAINT "FeishuUserIdentity_connectionId_fkey"
+  FOREIGN KEY ("connectionId") REFERENCES "OrganizationFeishuApplicationConnection"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE "FeishuUserIdentity"
+  ADD CONSTRAINT "FeishuUserIdentity_userId_fkey"
+  FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
diff --git a/hub/prisma/schema.prisma b/hub/prisma/schema.prisma
index 70db83a..632a55d 100644
--- a/hub/prisma/schema.prisma
+++ b/hub/prisma/schema.prisma
@@ -89,7 +89,9 @@ model OrganizationProjectSettings {
   organization Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
 }
 
-/// A Feishu user known to the Hub. principal sub-typology is OPEN (ADR-0004).
+/// A person known to the Hub. `feishuOpenId` remains a legacy compatibility
+/// key; new customer-app identities live in FeishuUserIdentity and store a
+/// connection-scoped opaque USER principal here instead of a raw open_id.
 model User {
   id           String   @id @default(cuid())
   feishuOpenId String   @unique
@@ -111,6 +113,7 @@ model User {
   auditEntries                 AuditEntry[]                  @relation("auditActor")
   providerCredentialVersions   ProviderCredentialVersion[]   @relation("providerCredentialVersionCreator")
   feishuCredentialVersions     FeishuApplicationCredentialVersion[] @relation("feishuCredentialVersionCreator")
+  feishuIdentities             FeishuUserIdentity[]
 }
 
 /// ADR-0024: exactly one customer-owned Feishu application connection may be
@@ -130,10 +133,32 @@ model OrganizationFeishuApplicationConnection {
   organization        Organization                       @relation(fields: [organizationId], references: [id], onDelete: Cascade)
   secretVersions      FeishuApplicationCredentialVersion[] @relation("feishuCredentialVersions")
   activeSecretVersion FeishuApplicationCredentialVersion?  @relation("activeFeishuCredentialVersion", fields: [activeSecretVersionId], references: [id], onDelete: Restrict)
+  userIdentities      FeishuUserIdentity[]
 
   @@index([status])
 }
 
+/// ADR-0024 / Issue 44: provider-local Feishu identities are never global.
+/// The same open_id may identify different people under different customer
+/// applications, so all lookup and uniqueness begins with connectionId.
+model FeishuUserIdentity {
+  id           String   @id @default(cuid())
+  connectionId String
+  userId       String
+  openId       String
+  unionId      String?
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+
+  connection OrganizationFeishuApplicationConnection @relation(fields: [connectionId], references: [id], onDelete: Cascade)
+  user       User                                    @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([connectionId, openId])
+  @@unique([connectionId, unionId])
+  @@unique([connectionId, userId])
+  @@index([userId])
+}
+
 /// ADR-0024: all Feishu app material, including provider-local app/bot ids, is
 /// inside one immutable authenticated envelope version.
 model FeishuApplicationCredentialVersion {
@@ -237,8 +262,8 @@ enum PlatformRole {
 }
 
 /// ADR-0019: typed principals for permission grants and actor resolution.
-/// USER is identified by Feishu open_id; TEAM by Hub Team.id; Feishu external
-/// principals by their Feishu ids.
+/// USER and Feishu external principals use connection-scoped opaque ids, never
+/// raw provider-local ids; TEAM uses Hub Team.id.
 enum PrincipalType {
   USER
   TEAM
diff --git a/hub/src/admin/auth/feishuOAuth.ts b/hub/src/admin/auth/feishuOAuth.ts
index 83cfdfe..aeb371d 100644
--- a/hub/src/admin/auth/feishuOAuth.ts
+++ b/hub/src/admin/auth/feishuOAuth.ts
@@ -1,14 +1,16 @@
 /**
  * Feishu web OAuth (user login) for org admin panel.
  *
- * Pilot uses the process-global FEISHU_APP_ID/SECRET (same app as the bot).
- * Per-org encrypted Feishu app secrets are deferred (ADR-0021).
+ * Organization login resolves the intended encrypted Feishu Application
+ * Connection before building the authorize URL or exchanging the code.
  *
  * Flow:
  *  1. GET authorize URL → user consents
  *  2. callback code → user_access_token (authen/v2/oauth/token)
  *  3. user_access_token → user info (authen/v1/user_info) → open_id
- */
+*/
+import { classifyNetworkFailure, type NetworkFailureCategory } from "../../connections/networkFailure.js";
+
 
 export interface FeishuOAuthConfig {
   readonly appId: string;
@@ -24,10 +26,23 @@ export interface FeishuOAuthConfig {
 
 export interface FeishuOAuthUser {
   readonly openId: string;
+  readonly unionId?: string | undefined;
   readonly displayName: string;
   readonly avatarUrl: string | null;
 }
 
+export class FeishuOAuthError extends Error {
+  constructor(
+    readonly code: "feishu_oauth_unreachable" | "feishu_oauth_rejected" | "feishu_oauth_invalid_response",
+    message: string,
+    readonly category: NetworkFailureCategory | "http" | "provider_rejection" | "invalid_response",
+    readonly upstreamStatus?: number,
+  ) {
+    super(message);
+    this.name = "FeishuOAuthError";
+  }
+}
+
 const DEFAULT_AUTHORIZE_BASE = "https://accounts.feishu.cn/open-apis/authen/v1/authorize";
 const DEFAULT_TOKEN_URL = "https://open.feishu.cn/open-apis/authen/v2/oauth/token";
 const DEFAULT_USER_INFO_URL = "https://open.feishu.cn/open-apis/authen/v1/user_info";
@@ -59,66 +74,118 @@ export async function exchangeCodeForUser(
 async function exchangeCodeForAccessToken(config: FeishuOAuthConfig, code: string): Promise<string> {
   const fetchImpl = config.fetchImpl ?? fetch;
   const tokenUrl = config.tokenUrl ?? DEFAULT_TOKEN_URL;
-  const res = await fetchImpl(tokenUrl, {
-    method: "POST",
-    headers: { "Content-Type": "application/json; charset=utf-8" },
-    body: JSON.stringify({
-      grant_type: "authorization_code",
-      client_id: config.appId,
-      client_secret: config.appSecret,
-      code,
-      redirect_uri: config.redirectUri,
-    }),
-  });
-  const body = (await res.json()) as {
-    code?: number;
-    access_token?: string;
-    error?: string;
-    error_description?: string;
-    msg?: string;
-  };
-  if (!res.ok || body.code !== 0 || typeof body.access_token !== "string" || body.access_token === "") {
-    const detail = body.error_description ?? body.error ?? body.msg ?? `HTTP ${res.status}`;
-    throw new Error(`Feishu OAuth token exchange failed: ${detail}`);
+  let res: Response;
+  try {
+    res = await fetchImpl(tokenUrl, {
+      method: "POST",
+      headers: { "Content-Type": "application/json; charset=utf-8" },
+      body: JSON.stringify({
+        grant_type: "authorization_code",
+        client_id: config.appId,
+        client_secret: config.appSecret,
+        code,
+        redirect_uri: config.redirectUri,
+      }),
+      redirect: "manual",
+      signal: AbortSignal.timeout(10_000),
+    });
+  } catch (error) {
+    throw new FeishuOAuthError(
+      "feishu_oauth_unreachable",
+      "Feishu OAuth token exchange could not reach provider",
+      classifyNetworkFailure(error),
+    );
   }
-  return body.access_token;
+  const body = await oauthJson(res, "token exchange");
+  if (!res.ok || body["code"] !== 0 ||
+      typeof body["access_token"] !== "string" || body["access_token"] === "") {
+    throw new FeishuOAuthError(
+      "feishu_oauth_rejected",
+      "Feishu OAuth token exchange was rejected",
+      res.ok ? "provider_rejection" : "http",
+      res.status,
+    );
+  }
+  return body["access_token"];
 }
 
 async function fetchUserInfo(config: FeishuOAuthConfig, userAccessToken: string): Promise<FeishuOAuthUser> {
   const fetchImpl = config.fetchImpl ?? fetch;
   const userInfoUrl = config.userInfoUrl ?? DEFAULT_USER_INFO_URL;
-  const res = await fetchImpl(userInfoUrl, {
-    method: "GET",
-    headers: { Authorization: `Bearer ${userAccessToken}` },
-  });
-  const body = (await res.json()) as {
-    code?: number;
-    msg?: string;
-    data?: {
-      open_id?: string;
-      name?: string;
-      en_name?: string;
-      avatar_url?: string;
-      avatar_middle?: string;
-    };
-  };
-  if (!res.ok || body.code !== 0 || body.data === undefined) {
-    throw new Error(`Feishu user_info failed: ${body.msg ?? `HTTP ${res.status}`}`);
+  let res: Response;
+  try {
+    res = await fetchImpl(userInfoUrl, {
+      method: "GET",
+      headers: { Authorization: `Bearer ${userAccessToken}` },
+      redirect: "manual",
+      signal: AbortSignal.timeout(10_000),
+    });
+  } catch (error) {
+    throw new FeishuOAuthError(
+      "feishu_oauth_unreachable",
+      "Feishu OAuth user info could not reach provider",
+      classifyNetworkFailure(error),
+    );
   }
-  const openId = body.data.open_id;
+  const body = await oauthJson(res, "user info");
+  const data = body["data"];
+  if (!res.ok || body["code"] !== 0 || !isRecord(data)) {
+    throw new FeishuOAuthError(
+      "feishu_oauth_rejected",
+      "Feishu OAuth user info was rejected",
+      res.ok ? "provider_rejection" : "http",
+      res.status,
+    );
+  }
+  const openId = data["open_id"];
   if (typeof openId !== "string" || openId === "") {
-    throw new Error("Feishu user_info response missing open_id");
+    throw new FeishuOAuthError(
+      "feishu_oauth_invalid_response",
+      "Feishu OAuth user info response is missing open_id",
+      "invalid_response",
+      res.status,
+    );
   }
   const displayName =
-    (typeof body.data.name === "string" && body.data.name !== "" ? body.data.name : null) ??
-    (typeof body.data.en_name === "string" && body.data.en_name !== "" ? body.data.en_name : null) ??
+    (typeof data["name"] === "string" && data["name"] !== "" ? data["name"] : null) ??
+    (typeof data["en_name"] === "string" && data["en_name"] !== "" ? data["en_name"] : null) ??
     openId;
   const avatar =
-    (typeof body.data.avatar_url === "string" && body.data.avatar_url !== ""
-      ? body.data.avatar_url
+    (typeof data["avatar_url"] === "string" && data["avatar_url"] !== ""
+      ? data["avatar_url"]
       : null) ??
-    (typeof body.data.avatar_middle === "string" && body.data.avatar_middle !== ""
-      ? body.data.avatar_middle
+    (typeof data["avatar_middle"] === "string" && data["avatar_middle"] !== ""
+      ? data["avatar_middle"]
       : null);
-  return { openId, displayName, avatarUrl: avatar };
+  const unionId = typeof data["union_id"] === "string" && data["union_id"] !== ""
+    ? data["union_id"]
+    : undefined;
+  return { openId, ...(unionId !== undefined ? { unionId } : {}), displayName, avatarUrl: avatar };
+}
+
+async function oauthJson(response: Response, operation: string): Promise<Record<string, unknown>> {
+  let value: unknown;
+  try {
+    value = await response.json();
+  } catch {
+    throw new FeishuOAuthError(
+      "feishu_oauth_invalid_response",
+      `Feishu OAuth ${operation} returned an invalid response`,
+      "invalid_response",
+      response.status,
+    );
+  }
+  if (!isRecord(value)) {
+    throw new FeishuOAuthError(
+      "feishu_oauth_invalid_response",
+      `Feishu OAuth ${operation} returned an invalid response`,
+      "invalid_response",
+      response.status,
+    );
+  }
+  return value;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
 }
diff --git a/hub/src/admin/auth/guards.ts b/hub/src/admin/auth/guards.ts
index 0557571..3917561 100644
--- a/hub/src/admin/auth/guards.ts
+++ b/hub/src/admin/auth/guards.ts
@@ -16,6 +16,8 @@ export const ORG_ADMIN_ROLES: readonly OrganizationMemberRole[] = ["OWNER", "ADM
 export interface AuthContext {
   readonly session: SessionPayload;
   readonly user: User;
+  readonly feishuOpenId: string;
+  readonly authenticationOrganizationId?: string | undefined;
 }
 
 export interface OrgAuthContext extends AuthContext {
@@ -55,12 +57,45 @@ export async function requireSession(
     await sendError(reply, 401, "unauthenticated", "session invalid or expired");
     return null;
   }
+  if ("feishuIdentityId" in session) {
+    const identity = await deps.prisma.feishuUserIdentity.findUnique({
+      where: { id: session.feishuIdentityId },
+      include: {
+        user: true,
+        connection: {
+          select: {
+            id: true,
+            status: true,
+            activeSecretVersion: { select: { connectionId: true, retiredAt: true } },
+            organization: { select: { id: true, status: true } },
+          },
+        },
+      },
+    });
+    if (identity === null || identity.userId !== session.userId ||
+        identity.connectionId !== session.feishuConnectionId ||
+        identity.connection.organization.id !== session.feishuOrganizationId ||
+        identity.connection.status !== "ACTIVE" ||
+        identity.connection.activeSecretVersion === null ||
+        identity.connection.activeSecretVersion.connectionId !== identity.connection.id ||
+        identity.connection.activeSecretVersion.retiredAt !== null ||
+        identity.connection.organization.status !== "ACTIVE") {
+      await sendError(reply, 401, "unauthenticated", "session identity not found or inactive");
+      return null;
+    }
+    return {
+      session,
+      user: identity.user,
+      feishuOpenId: identity.openId,
+      authenticationOrganizationId: identity.connection.organization.id,
+    };
+  }
   const user = await deps.prisma.user.findUnique({ where: { id: session.userId } });
   if (user === null || user.feishuOpenId !== session.feishuOpenId) {
     await sendError(reply, 401, "unauthenticated", "session user not found");
     return null;
   }
-  return { session, user };
+  return { session, user, feishuOpenId: user.feishuOpenId };
 }
 
 export async function requireOrgRole(
@@ -87,6 +122,11 @@ export async function requireOrgRole(
     await sendError(reply, 403, "org_not_active", `organization is ${organization.status}`);
     return null;
   }
+  if (auth.authenticationOrganizationId !== undefined &&
+      auth.authenticationOrganizationId !== organization.id) {
+    await sendError(reply, 403, "forbidden", "session is scoped to a different organization");
+    return null;
+  }
 
   const membership = await deps.prisma.organizationMembership.findFirst({
     where: {
diff --git a/hub/src/admin/auth/session.ts b/hub/src/admin/auth/session.ts
index a248511..105bde5 100644
--- a/hub/src/admin/auth/session.ts
+++ b/hub/src/admin/auth/session.ts
@@ -15,28 +15,41 @@ export const DEFAULT_SESSION_TTL_SECONDS = 7 * 24 * 60 * 60;
 /** OAuth state cookie TTL: 10 minutes. */
 export const OAUTH_STATE_TTL_SECONDS = 10 * 60;
 
-export interface SessionPayload {
-  readonly userId: string;
-  readonly feishuOpenId: string;
+interface SessionTimes {
   readonly iat: number;
   readonly exp: number;
 }
 
+export type SessionIdentity =
+  | {
+      readonly userId: string;
+      readonly feishuOpenId: string;
+    }
+  | {
+      readonly userId: string;
+      readonly feishuIdentityId: string;
+      readonly feishuConnectionId: string;
+      readonly feishuOrganizationId: string;
+    };
+
+export type SessionPayload = SessionIdentity & SessionTimes;
+
 export interface OAuthStatePayload {
   readonly nonce: string;
   readonly returnTo: string;
+  readonly organizationId?: string | undefined;
+  readonly connectionId?: string | undefined;
   readonly exp: number;
 }
 
 export function signSession(
-  payload: Omit<SessionPayload, "iat" | "exp">,
+  payload: SessionIdentity,
   secret: string,
   ttlSeconds: number = DEFAULT_SESSION_TTL_SECONDS,
   nowSeconds: number = Math.floor(Date.now() / 1000),
 ): string {
   const full: SessionPayload = {
-    userId: payload.userId,
-    feishuOpenId: payload.feishuOpenId,
+    ...payload,
     iat: nowSeconds,
     exp: nowSeconds + ttlSeconds,
   };
@@ -48,15 +61,38 @@ export function verifySession(
   secret: string,
   nowSeconds: number = Math.floor(Date.now() / 1000),
 ): SessionPayload | null {
-  const payload = verifyJson<SessionPayload>(token, secret);
+  const payload = verifyJson<Record<string, unknown>>(token, secret);
   if (payload === null) return null;
-  if (typeof payload.userId !== "string" || payload.userId === "") return null;
-  if (typeof payload.feishuOpenId !== "string" || payload.feishuOpenId === "") return null;
-  if (typeof payload.iat !== "number" || typeof payload.exp !== "number") return null;
-  if (payload.exp <= nowSeconds) return null;
-  return payload;
+  if (typeof payload["userId"] !== "string" || payload["userId"] === "") return null;
+  if (typeof payload["iat"] !== "number" || typeof payload["exp"] !== "number") return null;
+  if (payload["exp"] <= nowSeconds) return null;
+  const legacy = typeof payload["feishuOpenId"] === "string" && payload["feishuOpenId"] !== "";
+  const scoped = typeof payload["feishuIdentityId"] === "string" && payload["feishuIdentityId"] !== "" &&
+    typeof payload["feishuConnectionId"] === "string" && payload["feishuConnectionId"] !== "" &&
+    typeof payload["feishuOrganizationId"] === "string" && payload["feishuOrganizationId"] !== "";
+  if (legacy === scoped) return null;
+  if (legacy) {
+    return {
+      userId: payload["userId"],
+      feishuOpenId: payload["feishuOpenId"] as string,
+      iat: payload["iat"],
+      exp: payload["exp"],
+    };
+  }
+  return {
+    userId: payload["userId"],
+    feishuIdentityId: payload["feishuIdentityId"] as string,
+    feishuConnectionId: payload["feishuConnectionId"] as string,
+    feishuOrganizationId: payload["feishuOrganizationId"] as string,
+    iat: payload["iat"],
+    exp: payload["exp"],
+  };
 }
 
+/*
+ * OAuth state may be legacy/unscoped or bind both an Organization and its
+ * intended Feishu connection. A half-scoped state is always invalid.
+ */
 export function signOAuthState(
   payload: Omit<OAuthStatePayload, "exp">,
   secret: string,
@@ -64,8 +100,7 @@ export function signOAuthState(
   nowSeconds: number = Math.floor(Date.now() / 1000),
 ): string {
   const full: OAuthStatePayload = {
-    nonce: payload.nonce,
-    returnTo: payload.returnTo,
+    ...payload,
     exp: nowSeconds + ttlSeconds,
   };
   return signJson(full, secret);
@@ -81,7 +116,17 @@ export function verifyOAuthState(
   if (typeof payload.nonce !== "string" || payload.nonce === "") return null;
   if (typeof payload.returnTo !== "string") return null;
   if (typeof payload.exp !== "number" || payload.exp <= nowSeconds) return null;
-  return payload;
+  const hasOrganization = typeof payload.organizationId === "string" && payload.organizationId !== "";
+  const hasConnection = typeof payload.connectionId === "string" && payload.connectionId !== "";
+  if (hasOrganization !== hasConnection) return null;
+  return {
+    nonce: payload.nonce,
+    returnTo: payload.returnTo,
+    ...(hasOrganization
+      ? { organizationId: payload.organizationId!, connectionId: payload.connectionId! }
+      : {}),
+    exp: payload.exp,
+  };
 }
 
 function signJson(value: unknown, secret: string): string {
diff --git a/hub/src/admin/plugin.ts b/hub/src/admin/plugin.ts
index 96e5d01..5115942 100644
--- a/hub/src/admin/plugin.ts
+++ b/hub/src/admin/plugin.ts
@@ -23,6 +23,7 @@ export interface AdminPluginConfig {
   readonly cookieSecure?: boolean;
   readonly oauthScope?: string;
   readonly fetchImpl?: typeof fetch;
+  readonly allowLegacyFeishuOAuth?: boolean;
 }
 
 export async function registerAdminPlugin(
@@ -40,9 +41,13 @@ export async function registerAdminPlugin(
     publicBaseUrl: config.publicBaseUrl,
     feishuAppId: config.feishuAppId,
     feishuAppSecret: config.feishuAppSecret,
+    secretEnvelope: config.secretEnvelope,
     cookieSecure,
     ...(config.oauthScope !== undefined ? { oauthScope: config.oauthScope } : {}),
     ...(config.fetchImpl !== undefined ? { fetchImpl: config.fetchImpl } : {}),
+    ...(config.allowLegacyFeishuOAuth !== undefined
+      ? { allowLegacyFeishuOAuth: config.allowLegacyFeishuOAuth }
+      : {}),
   });
 
   await registerOrgRoutes(app, {
diff --git a/hub/src/admin/routes/authRoutes.ts b/hub/src/admin/routes/authRoutes.ts
index c9db9ad..6aff11e 100644
--- a/hub/src/admin/routes/authRoutes.ts
+++ b/hub/src/admin/routes/authRoutes.ts
@@ -4,10 +4,14 @@
 import { randomBytes } from "node:crypto";
 import type { PrismaClient } from "@prisma/client";
 import type { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
+import { resolveActiveFeishuApplication } from "../../connections/feishuApplicationConnections.js";
+import { upsertScopedFeishuIdentity } from "../../feishu/identityNamespace.js";
+import type { LocalSecretEnvelope } from "../../security/secretEnvelope.js";
 import {
   buildAuthorizeUrl,
   DEFAULT_OAUTH_SCOPE,
   exchangeCodeForUser,
+  FeishuOAuthError,
   type FeishuOAuthConfig,
 } from "../auth/feishuOAuth.js";
 import {
@@ -21,6 +25,7 @@ import {
   signOAuthState,
   signSession,
   verifyOAuthState,
+  type SessionIdentity,
 } from "../auth/session.js";
 import { handleRouteError } from "../errors.js";
 
@@ -30,15 +35,17 @@ export interface AuthRouteConfig {
   readonly publicBaseUrl: string;
   readonly feishuAppId: string;
   readonly feishuAppSecret: string;
+  readonly secretEnvelope: LocalSecretEnvelope;
   readonly oauthScope?: string;
   readonly cookieSecure: boolean;
   readonly fetchImpl?: typeof fetch;
+  readonly allowLegacyFeishuOAuth?: boolean;
 }
 
 export async function registerAuthRoutes(app: FastifyInstance, config: AuthRouteConfig): Promise<void> {
   const guardDeps: GuardDeps = { prisma: config.prisma, sessionSecret: config.sessionSecret };
   const redirectUri = `${trimTrailingSlash(config.publicBaseUrl)}/auth/feishu/callback`;
-  const oauthConfig: FeishuOAuthConfig = {
+  const legacyOauthConfig: FeishuOAuthConfig = {
     appId: config.feishuAppId,
     appSecret: config.feishuAppSecret,
     redirectUri,
@@ -46,25 +53,61 @@ export async function registerAuthRoutes(app: FastifyInstance, config: AuthRoute
     ...(config.fetchImpl !== undefined ? { fetchImpl: config.fetchImpl } : {}),
   };
 
-  app.get("/auth/feishu", async (request, reply) => {
+  if (config.allowLegacyFeishuOAuth === true) {
+    app.get("/auth/feishu", async (request, reply) => {
+      try {
+        const returnTo = sanitizeReturnTo(
+          typeof request.query === "object" && request.query !== null && "returnTo" in request.query
+            ? String((request.query as { returnTo?: string }).returnTo ?? "")
+            : "",
+        );
+        const nonce = randomBytes(16).toString("hex");
+        const stateToken = signOAuthState({ nonce, returnTo }, config.sessionSecret);
+        setOAuthNonceCookie(reply, nonce, config.cookieSecure);
+        const url = buildAuthorizeUrl(legacyOauthConfig, stateToken);
+        return reply.redirect(url);
+      } catch (err) {
+        return handleRouteError(reply, err);
+      }
+    });
+  }
+
+  app.get("/auth/feishu/:orgSlug", async (request, reply) => {
     try {
+      const { orgSlug } = request.params as { orgSlug: string };
+      const organization = await config.prisma.organization.findUnique({
+        where: { slug: orgSlug },
+        select: { id: true, status: true },
+      });
+      if (organization === null) throw new HttpError(404, "org_not_found", `organization not found: ${orgSlug}`);
+      if (organization.status !== "ACTIVE") {
+        throw new HttpError(403, "org_not_active", `organization is ${organization.status}`);
+      }
+      const credential = await resolveActiveFeishuApplication(
+        config.prisma,
+        config.secretEnvelope,
+        { organizationId: organization.id },
+      );
       const returnTo = sanitizeReturnTo(
         typeof request.query === "object" && request.query !== null && "returnTo" in request.query
           ? String((request.query as { returnTo?: string }).returnTo ?? "")
           : "",
       );
       const nonce = randomBytes(16).toString("hex");
-      const stateToken = signOAuthState({ nonce, returnTo }, config.sessionSecret);
-      // state query param is the signed blob (CSRF + returnTo). Cookie mirrors nonce for double-submit.
-      reply.setCookie(OAUTH_STATE_COOKIE_NAME, nonce, {
-        path: "/",
-        httpOnly: true,
-        sameSite: "lax",
-        secure: config.cookieSecure,
-        maxAge: 600,
-      });
-      const url = buildAuthorizeUrl(oauthConfig, stateToken);
-      return reply.redirect(url);
+      const stateToken = signOAuthState({
+        nonce,
+        returnTo,
+        organizationId: organization.id,
+        connectionId: credential.connectionId,
+      }, config.sessionSecret);
+      setOAuthNonceCookie(reply, nonce, config.cookieSecure);
+      return reply.redirect(buildAuthorizeUrl({
+        appId: credential.appId,
+        appSecret: credential.appSecret,
+        redirectUri,
+        scope: config.oauthScope ?? DEFAULT_OAUTH_SCOPE,
+        ...(config.fetchImpl !== undefined ? { fetchImpl: config.fetchImpl } : {}),
+      }, stateToken));
     } catch (err) {
       return handleRouteError(reply, err);
     }
@@ -96,33 +139,93 @@ export async function registerAuthRoutes(app: FastifyInstance, config: AuthRoute
       }
       reply.clearCookie(OAUTH_STATE_COOKIE_NAME, { path: "/" });
 
-      const feishuUser = await exchangeCodeForUser(oauthConfig, code);
-      const user = await config.prisma.user.upsert({
-        where: { feishuOpenId: feishuUser.openId },
-        create: {
-          feishuOpenId: feishuUser.openId,
-          displayName: feishuUser.displayName,
-          avatarUrl: feishuUser.avatarUrl,
-        },
-        update: {
-          displayName: feishuUser.displayName,
-          avatarUrl: feishuUser.avatarUrl,
-        },
-      });
+      let oauthConfig = legacyOauthConfig;
+      if (statePayload.connectionId === undefined && config.allowLegacyFeishuOAuth !== true) {
+        throw new HttpError(400, "bad_request", "unscoped Feishu OAuth is disabled");
+      }
+      if (statePayload.connectionId !== undefined && statePayload.organizationId !== undefined) {
+        const credential = await resolveActiveFeishuApplication(
+          config.prisma,
+          config.secretEnvelope,
+          { connectionId: statePayload.connectionId },
+        );
+        if (credential.organizationId !== statePayload.organizationId) {
+          throw new HttpError(400, "bad_request", "OAuth state Organization scope mismatch");
+        }
+        oauthConfig = {
+          appId: credential.appId,
+          appSecret: credential.appSecret,
+          redirectUri,
+          scope: config.oauthScope ?? DEFAULT_OAUTH_SCOPE,
+          ...(config.fetchImpl !== undefined ? { fetchImpl: config.fetchImpl } : {}),
+        };
+      }
 
-      setSessionCookie(reply, config, {
-        userId: user.id,
-        feishuOpenId: user.feishuOpenId,
-      });
+      const feishuUser = await exchangeCodeForUser(oauthConfig, code);
+      let userId: string;
+      if (statePayload.connectionId !== undefined && statePayload.organizationId !== undefined) {
+        const identity = await upsertScopedFeishuIdentity(config.prisma, {
+          connectionId: statePayload.connectionId,
+          openId: feishuUser.openId,
+          ...(feishuUser.unionId !== undefined ? { unionId: feishuUser.unionId } : {}),
+          displayName: feishuUser.displayName,
+          ...(feishuUser.avatarUrl !== null ? { avatarUrl: feishuUser.avatarUrl } : {}),
+        });
+        if (identity.organizationId !== statePayload.organizationId) {
+          throw new HttpError(400, "bad_request", "OAuth identity Organization scope mismatch");
+        }
+        userId = identity.userId;
+        setSessionCookie(reply, config, {
+          userId,
+          feishuIdentityId: identity.identityId,
+          feishuConnectionId: identity.connectionId,
+          feishuOrganizationId: identity.organizationId,
+        });
+      } else {
+        const user = await config.prisma.user.upsert({
+          where: { feishuOpenId: feishuUser.openId },
+          create: {
+            feishuOpenId: feishuUser.openId,
+            displayName: feishuUser.displayName,
+            avatarUrl: feishuUser.avatarUrl,
+          },
+          update: {
+            displayName: feishuUser.displayName,
+            avatarUrl: feishuUser.avatarUrl,
+          },
+        });
+        userId = user.id;
+        setSessionCookie(reply, config, {
+          userId,
+          feishuOpenId: user.feishuOpenId,
+        });
+      }
 
       const destination = await resolvePostLoginRedirect(
         config.prisma,
-        user.id,
+        userId,
         statePayload.returnTo,
+        statePayload.organizationId !== undefined
+          ? { intendedOrganizationId: statePayload.organizationId }
+          : {},
       );
       return reply.redirect(destination);
     } catch (err) {
-      request.log.error({ err }, "feishu oauth callback failed");
+      request.log.error({
+        requestId: request.id,
+        operation: "feishu_oauth.callback",
+        ...(err instanceof FeishuOAuthError
+          ? {
+              errorCode: err.code,
+              failureCategory: err.category,
+              ...(err.upstreamStatus !== undefined ? { upstreamStatus: err.upstreamStatus } : {}),
+            }
+          : {
+              errorCode: "feishu_oauth_callback_failed",
+              errorType: err instanceof Error ? err.name : typeof err,
+              err,
+            }),
+      }, "feishu oauth callback failed");
       return reply.redirect(`/admin/login?error=${encodeURIComponent("oauth_failed")}`);
     }
   });
@@ -138,7 +241,13 @@ export async function registerAuthRoutes(app: FastifyInstance, config: AuthRoute
       if (auth === null) return;
 
       const memberships = await config.prisma.organizationMembership.findMany({
-        where: { userId: auth.user.id, revokedAt: null },
+        where: {
+          userId: auth.user.id,
+          revokedAt: null,
+          ...(auth.authenticationOrganizationId !== undefined
+            ? { organizationId: auth.authenticationOrganizationId }
+            : {}),
+        },
         select: {
           role: true,
           organization: {
@@ -151,7 +260,7 @@ export async function registerAuthRoutes(app: FastifyInstance, config: AuthRoute
       return {
         user: {
           id: auth.user.id,
-          feishuOpenId: auth.user.feishuOpenId,
+          feishuOpenId: auth.feishuOpenId,
           displayName: auth.user.displayName,
           avatarUrl: auth.user.avatarUrl,
         },
@@ -170,12 +279,16 @@ export async function registerAuthRoutes(app: FastifyInstance, config: AuthRoute
 
   // Minimal login page until admin SPA lands (PR7).
   app.get("/admin/login", async (request: FastifyRequest, reply: FastifyReply) => {
-    const q = request.query as { error?: string; returnTo?: string };
+    const q = request.query as { error?: string; returnTo?: string; orgSlug?: string };
     const returnTo = sanitizeReturnTo(q.returnTo ?? "");
-    const loginHref =
-      returnTo === "/admin"
-        ? "/auth/feishu"
-        : `/auth/feishu?returnTo=${encodeURIComponent(returnTo)}`;
+    const orgSlug = typeof q.orgSlug === "string" && /^[a-z0-9][a-z0-9-]*$/.test(q.orgSlug)
+      ? q.orgSlug
+      : null;
+    const loginHref = orgSlug === null
+      ? null
+      : returnTo === "/admin"
+        ? `/auth/feishu/${encodeURIComponent(orgSlug)}`
+        : `/auth/feishu/${encodeURIComponent(orgSlug)}?returnTo=${encodeURIComponent(returnTo)}`;
     const errorHtml =
       typeof q.error === "string" && q.error !== ""
         ? `<p class="err">Login failed: ${escapeHtml(q.error)}</p>`
@@ -199,7 +312,9 @@ export async function registerAuthRoutes(app: FastifyInstance, config: AuthRoute
     <h1>Org Admin</h1>
     <p>Sign in with Feishu to manage your organization.</p>
     ${errorHtml}
-    <a class="btn" href="${escapeHtml(loginHref)}">Login with Feishu</a>
+    ${loginHref === null
+      ? "<p>请从组织专属登录链接进入。</p>"
+      : `<a class="btn" href="${escapeHtml(loginHref)}">Login with Feishu</a>`}
   </div>
 </body>
 </html>`;
@@ -210,7 +325,7 @@ export async function registerAuthRoutes(app: FastifyInstance, config: AuthRoute
 export function setSessionCookie(
   reply: FastifyReply,
   config: Pick<AuthRouteConfig, "sessionSecret" | "cookieSecure">,
-  identity: { readonly userId: string; readonly feishuOpenId: string },
+  identity: SessionIdentity,
 ): void {
   const token = signSession(identity, config.sessionSecret);
   reply.setCookie(SESSION_COOKIE_NAME, token, {
@@ -224,7 +339,7 @@ export function setSessionCookie(
 
 /** Exported for tests that need a pre-authenticated cookie value. */
 export function mintSessionToken(
-  identity: { readonly userId: string; readonly feishuOpenId: string },
+  identity: SessionIdentity,
   sessionSecret: string,
 ): string {
   return signSession(identity, sessionSecret);
@@ -238,7 +353,22 @@ async function resolvePostLoginRedirect(
   prisma: PrismaClient,
   userId: string,
   returnTo: string,
+  options: { readonly intendedOrganizationId?: string | undefined } = {},
 ): Promise<string> {
+  if (options.intendedOrganizationId !== undefined) {
+    const intended = await prisma.organizationMembership.findFirst({
+      where: {
+        userId,
+        organizationId: options.intendedOrganizationId,
+        revokedAt: null,
+        organization: { status: "ACTIVE" },
+      },
+      select: { organization: { select: { slug: true } } },
+    });
+    if (intended === null) return "/admin?error=not_an_active_org_member";
+    const orgRoot = `/admin/org/${intended.organization.slug}`;
+    return returnTo === orgRoot || returnTo.startsWith(`${orgRoot}/`) ? returnTo : orgRoot;
+  }
   if (returnTo !== "/admin" && returnTo.startsWith("/admin")) {
     return returnTo;
   }
@@ -267,6 +397,17 @@ async function resolvePostLoginRedirect(
   return "/admin/login?error=no_organization";
 }
 
+function setOAuthNonceCookie(reply: FastifyReply, nonce: string, secure: boolean): void {
+  // Signed state carries scope/returnTo; the cookie mirrors nonce for double-submit CSRF.
+  reply.setCookie(OAUTH_STATE_COOKIE_NAME, nonce, {
+    path: "/",
+    httpOnly: true,
+    sameSite: "lax",
+    secure,
+    maxAge: 600,
+  });
+}
+
 /**
  * Only allow relative same-origin paths under /admin to avoid open redirects.
  */
diff --git a/hub/src/admin/routes/explorerRoutes.ts b/hub/src/admin/routes/explorerRoutes.ts
index dad15b5..7d28f2d 100644
--- a/hub/src/admin/routes/explorerRoutes.ts
+++ b/hub/src/admin/routes/explorerRoutes.ts
@@ -130,7 +130,7 @@ export async function registerExplorerRoutes(
       }
       const result = await createOrgProject(config.prisma, {
         organizationId: auth.organization.id,
-        actorFeishuOpenId: auth.user.feishuOpenId,
+        actorFeishuOpenId: auth.feishuOpenId,
         name: body.name,
         workspaceRoot: config.projectWorkspaceRoot,
         ...(typeof body.folderId === "string" ? { folderId: body.folderId } : {}),
@@ -219,7 +219,7 @@ export async function registerExplorerRoutes(
       return await archiveOrgProjectChatBinding(config.prisma, {
         organizationId: auth.organization.id,
         projectId,
-        actorFeishuOpenId: auth.user.feishuOpenId,
+        actorFeishuOpenId: auth.feishuOpenId,
       });
     } catch (err) {
       return handleRouteError(reply, err);
diff --git a/hub/src/connections/feishuApplicationConnections.ts b/hub/src/connections/feishuApplicationConnections.ts
index 4fd57ac..6cd7b6c 100644
--- a/hub/src/connections/feishuApplicationConnections.ts
+++ b/hub/src/connections/feishuApplicationConnections.ts
@@ -32,7 +32,7 @@ export interface ResolvedFeishuApplication extends Required<FeishuApplicationCre
   readonly organizationId: string;
 }
 
-interface FeishuSecretPayloadV1 extends Required<FeishuApplicationCredentialInput> {
+export interface FeishuSecretPayloadV1 extends Required<FeishuApplicationCredentialInput> {
   readonly schemaVersion: 1;
 }
 
@@ -46,8 +46,8 @@ export class FeishuApplicationConnectionService {
   async rotateCustomerApplication(
     input: RotateFeishuApplicationInput,
   ): Promise<FeishuApplicationConnectionMetadata & { readonly created: boolean }> {
-    const payload = validateCredential(input);
-    const appIdentityFingerprint = fingerprintAppId(payload.appId);
+    const payload = validateFeishuApplicationCredential(input);
+    const appIdentityFingerprint = fingerprintFeishuAppId(payload.appId);
     await this.prisma.$transaction(async (tx) => {
       await requireFeishuAdmin(tx, input);
       await assertAppIdentityAvailable(tx, input.organizationId, appIdentityFingerprint);
@@ -287,7 +287,7 @@ export function decryptFeishuCredential(
     secretVersionId: input.secretVersionId,
   }, envelope);
   const validated = validateStoredPayload(payload);
-  if (fingerprintAppId(validated.appId) !== input.appIdentityFingerprint) {
+  if (fingerprintFeishuAppId(validated.appId) !== input.appIdentityFingerprint) {
     throw new Error("Feishu Application app identity fingerprint mismatch");
   }
   return validated;
@@ -387,7 +387,7 @@ export async function rewrapStoredFeishuApplicationEnvelopes(
   return { verified, rewrapped };
 }
 
-function validateCredential(input: FeishuApplicationCredentialInput): FeishuSecretPayloadV1 {
+export function validateFeishuApplicationCredential(input: FeishuApplicationCredentialInput): FeishuSecretPayloadV1 {
   const appId = nonEmpty(input.appId, "Feishu appId");
   const appSecret = nonEmpty(input.appSecret, "Feishu appSecret");
   const botOpenId = nonEmpty(input.botOpenId, "Feishu botOpenId");
@@ -474,7 +474,7 @@ function metadata(
   };
 }
 
-function fingerprintAppId(appId: string): string {
+export function fingerprintFeishuAppId(appId: string): string {
   return createHash("sha256").update("cph-feishu-app\0").update(appId, "utf8").digest("hex");
 }
 
diff --git a/hub/src/deployment/bootstrap-silo-cli.ts b/hub/src/deployment/bootstrap-silo-cli.ts
new file mode 100644
index 0000000..9d2e643
--- /dev/null
+++ b/hub/src/deployment/bootstrap-silo-cli.ts
@@ -0,0 +1,158 @@
+#!/usr/bin/env node
+import { lstat, readFile } from "node:fs/promises";
+import { execFile } from "node:child_process";
+import { promisify } from "node:util";
+import { PrismaClient } from "@prisma/client";
+import { bootstrapAlphaSilo, type AlphaSiloBootstrapInput } from "./bootstrap-silo.js";
+import { loadLocalSecretKeyringFile, LocalSecretEnvelope } from "../security/secretEnvelope.js";
+import { readSiloOrganizationId } from "./silo.js";
+
+const execFileAsync = promisify(execFile);
+
+async function main(): Promise<void> {
+  if (process.getuid?.() !== 0) throw new Error("Alpha Silo bootstrap must run as root");
+  await requireStoppedSilo();
+  const { configFile, keyringFile } = parseArgs(process.argv.slice(2));
+  await requireRootPrivateFile(configFile, "bootstrap config");
+  await requireRootPrivateFile(keyringFile, "secret keyring");
+  const databaseUrl = process.env["DATABASE_URL"]?.trim();
+  if (databaseUrl === undefined || databaseUrl === "") throw new Error("DATABASE_URL is required");
+  const input = parseConfig(await readFile(configFile, "utf8"));
+  const configuredOrganizationId = readSiloOrganizationId();
+  if (input.organization.id !== configuredOrganizationId) {
+    throw new Error(
+      `bootstrap Organization ${input.organization.id} does not match HUB_SILO_ORGANIZATION_ID ${configuredOrganizationId}`,
+    );
+  }
+  const secrets = new LocalSecretEnvelope(await loadLocalSecretKeyringFile(keyringFile));
+  const prisma = new PrismaClient({ datasources: { db: { url: databaseUrl } }, log: [] });
+  try {
+    const result = await bootstrapAlphaSilo(prisma, secrets, input);
+    console.log(JSON.stringify(result));
+  } finally {
+    await prisma.$disconnect();
+  }
+}
+
+async function requireStoppedSilo(): Promise<void> {
+  const unit = process.env["HUB_SYSTEMD_UNIT"]?.trim();
+  if (unit === undefined || !/^cph-hub-[a-z0-9][a-z0-9-]*\.service$/.test(unit)) {
+    throw new Error("HUB_SYSTEMD_UNIT must name the Silo being bootstrapped");
+  }
+  let state: string;
+  try {
+    const result = await execFileAsync("systemctl", ["show", "--property=ActiveState", "--value", unit], {
+      timeout: 10_000,
+    });
+    state = result.stdout.trim();
+  } catch (error) {
+    throw new Error(`cannot verify that ${unit} is stopped`, { cause: error });
+  }
+  if (state !== "inactive" && state !== "failed") {
+    throw new Error(`${unit} must be stopped before bootstrap; state=${state || "unknown"}`);
+  }
+}
+
+function parseArgs(argv: readonly string[]): { readonly configFile: string; readonly keyringFile: string } {
+  if (argv.length !== 4 || argv[0] !== "--config-file" || argv[2] !== "--keyring-file" ||
+      argv[1] === undefined || argv[1] === "" || argv[3] === undefined || argv[3] === "") {
+    throw new Error("usage: bootstrap-silo --config-file /root/bootstrap.json --keyring-file /root/keyring.json");
+  }
+  return { configFile: argv[1], keyringFile: argv[3] };
+}
+
+async function requireRootPrivateFile(path: string, label: string): Promise<void> {
+  const metadata = await lstat(path);
+  if (metadata.isSymbolicLink() || !metadata.isFile()) throw new Error(`${label} is not a regular file: ${path}`);
+  if (metadata.uid !== 0 || (metadata.mode & 0o077) !== 0) {
+    throw new Error(`${label} must be root-owned and inaccessible by group/others: ${path}`);
+  }
+}
+
+function parseConfig(source: string): AlphaSiloBootstrapInput {
+  let value: unknown;
+  try {
+    value = JSON.parse(source);
+  } catch (error) {
+    throw new Error("bootstrap config is not valid JSON", { cause: error });
+  }
+  if (!isRecord(value) || !isRecord(value["organization"]) || !isRecord(value["owner"]) ||
+      !isRecord(value["feishu"]) || !isRecord(value["provider"])) {
+    throw new Error("bootstrap config must contain organization, owner, feishu, and provider objects");
+  }
+  const organization = value["organization"];
+  const owner = value["owner"];
+  const feishu = value["feishu"];
+  const provider = value["provider"];
+  const teams = value["teams"];
+  if (teams !== undefined && !Array.isArray(teams)) throw new Error("bootstrap teams must be an array");
+  return {
+    organization: {
+      id: stringField(organization, "id"),
+      slug: stringField(organization, "slug"),
+      name: stringField(organization, "name"),
+    },
+    owner: {
+      openId: stringField(owner, "openId"),
+      displayName: stringField(owner, "displayName"),
+      ...(optionalStringField(owner, "unionId") !== undefined
+        ? { unionId: optionalStringField(owner, "unionId")! }
+        : {}),
+    },
+    feishu: {
+      appId: stringField(feishu, "appId"),
+      appSecret: stringField(feishu, "appSecret"),
+      botOpenId: stringField(feishu, "botOpenId"),
+      ...(optionalStringField(feishu, "verificationToken") !== undefined
+        ? { verificationToken: optionalStringField(feishu, "verificationToken")! }
+        : {}),
+      ...(optionalStringField(feishu, "encryptKey") !== undefined
+        ? { encryptKey: optionalStringField(feishu, "encryptKey")! }
+        : {}),
+    },
+    provider: {
+      providerId: stringField(provider, "providerId"),
+      baseUrl: stringField(provider, "baseUrl"),
+      authToken: stringField(provider, "authToken"),
+      ...(optionalStringField(provider, "anthropicApiKey") !== undefined
+        ? { anthropicApiKey: optionalStringField(provider, "anthropicApiKey")! }
+        : {}),
+    },
+    ...(Array.isArray(teams)
+      ? {
+          teams: teams.map((team, index) => {
+            if (!isRecord(team)) throw new Error(`bootstrap teams[${index}] must be an object`);
+            return {
+              slug: stringField(team, "slug"),
+              name: stringField(team, "name"),
+              ...(optionalStringField(team, "description") !== undefined
+                ? { description: optionalStringField(team, "description")! }
+                : {}),
+            };
+          }),
+        }
+      : {}),
+  };
+}
+
+function stringField(value: Record<string, unknown>, name: string): string {
+  const field = value[name];
+  if (typeof field !== "string" || field.trim() === "") throw new Error(`bootstrap ${name} is required`);
+  return field;
+}
+
+function optionalStringField(value: Record<string, unknown>, name: string): string | undefined {
+  const field = value[name];
+  if (field === undefined) return undefined;
+  if (typeof field !== "string") throw new Error(`bootstrap ${name} must be a string`);
+  return field;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+main().catch((error: unknown) => {
+  console.error(`[bootstrap-silo] failed: ${error instanceof Error ? error.message : String(error)}`);
+  process.exitCode = 1;
+});
diff --git a/hub/src/deployment/bootstrap-silo.ts b/hub/src/deployment/bootstrap-silo.ts
new file mode 100644
index 0000000..8ff6486
--- /dev/null
+++ b/hub/src/deployment/bootstrap-silo.ts
@@ -0,0 +1,365 @@
+import { randomUUID } from "node:crypto";
+import type { Prisma, PrismaClient } from "@prisma/client";
+import {
+  fingerprintFeishuAppId,
+  validateFeishuApplicationCredential,
+  type FeishuApplicationCredentialInput,
+} from "../connections/feishuApplicationConnections.js";
+import {
+  decryptStoredProviderCredential,
+  ProviderConnectionService,
+  type ProviderCredentialInput,
+} from "../connections/providerConnections.js";
+import { probeFeishuApplication, type FeishuReadinessProbe } from "../connections/feishuReadiness.js";
+import { probeOpenRouterCredential, type ProviderReadinessProbe } from "../connections/providerReadiness.js";
+import { deterministicFeishuUserId, scopedFeishuPrincipalId } from "../feishu/identityNamespace.js";
+import { LocalSecretEnvelope } from "../security/secretEnvelope.js";
+
+export interface AlphaSiloBootstrapInput {
+  readonly organization: { readonly id: string; readonly slug: string; readonly name: string };
+  readonly owner: { readonly openId: string; readonly displayName: string; readonly unionId?: string };
+  readonly feishu: FeishuApplicationCredentialInput;
+  readonly provider: ProviderCredentialInput & { readonly providerId: string };
+  readonly teams?: readonly {
+    readonly slug: string;
+    readonly name: string;
+    readonly description?: string;
+  }[];
+}
+
+export interface AlphaSiloBootstrapResult {
+  readonly organizationId: string;
+  readonly ownerUserId: string;
+  readonly feishuConnectionId: string;
+  readonly initialized: boolean;
+  readonly providerConfigured: boolean;
+}
+
+/**
+ * Idempotently bootstrap the one Organization allowed in an Alpha Silo.
+ * Secrets are accepted only in-memory and persisted as authenticated envelopes.
+ */
+export async function bootstrapAlphaSilo(
+  prisma: PrismaClient,
+  secrets: LocalSecretEnvelope,
+  input: AlphaSiloBootstrapInput,
+  probes: {
+    readonly feishu?: FeishuReadinessProbe;
+    readonly provider?: ProviderReadinessProbe;
+  } = {},
+): Promise<AlphaSiloBootstrapResult> {
+  const normalized = validateInput(input);
+  const existing = await loadExistingSilo(prisma, normalized.organization.id, normalized.owner.openId);
+  let initialized = false;
+  let ownerUserId: string;
+  let feishuConnectionId: string;
+
+  if (existing === null) {
+    await (probes.feishu ?? probeFeishuApplication)(normalized.feishu);
+    const initializedSilo = await initializeSilo(prisma, secrets, normalized);
+    initialized = true;
+    ownerUserId = initializedSilo.ownerUserId;
+    feishuConnectionId = initializedSilo.feishuConnectionId;
+  } else {
+    ownerUserId = existing.ownerUserId;
+    feishuConnectionId = existing.feishuConnectionId;
+    const expectedFingerprint = fingerprintFeishuAppId(normalized.feishu.appId);
+    if (existing.appIdentityFingerprint !== expectedFingerprint) {
+      throw new Error("bootstrap Feishu app identity does not match the existing Silo");
+    }
+  }
+
+  const providerService = new ProviderConnectionService(
+    prisma,
+    secrets,
+    probes.provider ?? probeOpenRouterCredential,
+  );
+  const existingProviders = await providerService.list(normalized.organization.id);
+  const existingProvider = existingProviders.find((connection) => connection.providerId === normalized.provider.providerId);
+  if (existingProvider === undefined) {
+    await providerService.rotateByok({
+      organizationId: normalized.organization.id,
+      actorUserId: ownerUserId,
+      providerId: normalized.provider.providerId,
+      baseUrl: normalized.provider.baseUrl,
+      authToken: normalized.provider.authToken,
+      ...(normalized.provider.anthropicApiKey !== undefined
+        ? { anthropicApiKey: normalized.provider.anthropicApiKey }
+        : {}),
+    });
+  } else if (existingProvider.status !== "ACTIVE" || existingProvider.mode !== "BYOK") {
+    throw new Error(`bootstrap provider ${normalized.provider.providerId} exists but is not ACTIVE BYOK`);
+  } else {
+    const stored = await loadExistingProviderCredential(
+      prisma,
+      secrets,
+      normalized.organization.id,
+      normalized.provider.providerId,
+    );
+    if (stored.baseUrl !== normalized.provider.baseUrl || stored.authToken !== normalized.provider.authToken ||
+        stored.anthropicApiKey !== (normalized.provider.anthropicApiKey ?? "")) {
+      throw new Error(`bootstrap provider ${normalized.provider.providerId} credential does not match existing Silo`);
+    }
+  }
+
+  await ensureBootstrapTeams(prisma, normalized.organization.id, ownerUserId, normalized.teams ?? []);
+
+  return {
+    organizationId: normalized.organization.id,
+    ownerUserId,
+    feishuConnectionId,
+    initialized,
+    providerConfigured: true,
+  };
+}
+
+async function ensureBootstrapTeams(
+  prisma: PrismaClient,
+  organizationId: string,
+  ownerUserId: string,
+  teams: NonNullable<AlphaSiloBootstrapInput["teams"]>,
+): Promise<void> {
+  await prisma.$transaction(async (tx) => {
+    for (const team of teams) {
+      const existing = await tx.team.findFirst({
+        where: { organizationId, slug: team.slug, archivedAt: null },
+        select: { id: true, name: true, description: true },
+      });
+      if (existing !== null && (existing.name !== team.name || existing.description !== (team.description ?? null))) {
+        throw new Error(`bootstrap Team ${team.slug} does not match the existing Silo`);
+      }
+      const teamId = existing?.id ?? (await tx.team.create({
+        data: {
+          organizationId,
+          slug: team.slug,
+          name: team.name,
+          ...(team.description !== undefined ? { description: team.description } : {}),
+        },
+        select: { id: true },
+      })).id;
+      const membership = await tx.teamMembership.findFirst({
+        where: { teamId, userId: ownerUserId, revokedAt: null },
+        select: { id: true },
+      });
+      if (membership === null) await tx.teamMembership.create({ data: { teamId, userId: ownerUserId } });
+    }
+  });
+}
+
+async function initializeSilo(
+  prisma: PrismaClient,
+  secrets: LocalSecretEnvelope,
+  input: AlphaSiloBootstrapInput,
+): Promise<{ readonly ownerUserId: string; readonly feishuConnectionId: string }> {
+  const connectionId = randomUUID();
+  const secretVersionId = randomUUID();
+  const identityId = randomUUID();
+  const ownerUserId = deterministicFeishuUserId(connectionId, input.owner.openId);
+  const appIdentityFingerprint = fingerprintFeishuAppId(input.feishu.appId);
+  const payload = validateFeishuApplicationCredential(input.feishu);
+  const envelope = secrets.encryptJson({
+    purpose: "feishu-application",
+    organizationId: input.organization.id,
+    connectionId,
+    secretVersionId,
+  }, payload);
+
+  await prisma.$transaction(async (tx) => {
+    const count = await tx.organization.count();
+    if (count !== 0) throw new Error(`Silo bootstrap requires an empty Organization set; found ${count}`);
+    await tx.organization.create({ data: { ...input.organization } });
+    await tx.organizationProjectSettings.create({
+      data: { organizationId: input.organization.id, membersCanCreateProjects: true },
+    });
+    await tx.folder.create({
+      data: {
+        organizationId: input.organization.id,
+        name: "Inbox",
+        sortKey: "000000",
+      },
+    });
+    await tx.user.create({
+      data: {
+        id: ownerUserId,
+        feishuOpenId: scopedFeishuPrincipalId("USER", connectionId, input.owner.openId),
+        displayName: input.owner.displayName,
+      },
+    });
+    await tx.organizationFeishuApplicationConnection.create({
+      data: {
+        id: connectionId,
+        organizationId: input.organization.id,
+        appIdentityFingerprint,
+        status: "DRAFT",
+      },
+    });
+    await tx.feishuUserIdentity.create({
+      data: {
+        id: identityId,
+        connectionId,
+        userId: ownerUserId,
+        openId: input.owner.openId,
+        ...(input.owner.unionId !== undefined ? { unionId: input.owner.unionId } : {}),
+      },
+    });
+    await tx.organizationMembership.create({
+      data: { organizationId: input.organization.id, userId: ownerUserId, role: "OWNER" },
+    });
+    for (const team of input.teams ?? []) {
+      await tx.team.create({
+        data: {
+          organizationId: input.organization.id,
+          slug: team.slug,
+          name: team.name,
+          ...(team.description !== undefined ? { description: team.description } : {}),
+          memberships: { create: { userId: ownerUserId } },
+        },
+      });
+    }
+    await tx.feishuApplicationCredentialVersion.create({
+      data: {
+        id: secretVersionId,
+        connectionId,
+        version: 1,
+        envelopeVersion: envelope.version,
+        keyId: envelope.keyId,
+        envelope: envelope as unknown as Prisma.InputJsonValue,
+        createdByUserId: ownerUserId,
+      },
+    });
+    await tx.organizationFeishuApplicationConnection.update({
+      where: { id: connectionId },
+      data: {
+        status: "ACTIVE",
+        activeSecretVersionId: secretVersionId,
+        activatedAt: new Date(),
+      },
+    });
+    await tx.auditEntry.create({
+      data: {
+        organizationId: input.organization.id,
+        actorUserId: ownerUserId,
+        action: "alpha_silo.bootstrapped",
+        metadata: {
+          connectionId,
+          ownerIdentityId: identityId,
+          envelopeVersion: envelope.version,
+          keyId: envelope.keyId,
+        },
+      },
+    });
+  });
+  return { ownerUserId, feishuConnectionId: connectionId };
+}
+
+async function loadExistingSilo(
+  prisma: PrismaClient,
+  organizationId: string,
+  ownerOpenId: string,
+): Promise<{
+  readonly ownerUserId: string;
+  readonly feishuConnectionId: string;
+  readonly appIdentityFingerprint: string;
+} | null> {
+  const organizations = await prisma.organization.findMany({
+    take: 2,
+    include: {
+      memberships: {
+        where: { role: "OWNER", revokedAt: null },
+        take: 2,
+        include: { user: { include: { feishuIdentities: true } } },
+      },
+      feishuApplicationConnection: true,
+    },
+  });
+  if (organizations.length === 0) return null;
+  if (organizations.length !== 1 || organizations[0]!.id !== organizationId) {
+    throw new Error("bootstrap database is not the configured single-Organization Silo");
+  }
+  const organization = organizations[0]!;
+  if (organization.status !== "ACTIVE" || organization.memberships.length !== 1 ||
+      organization.feishuApplicationConnection?.status !== "ACTIVE") {
+    throw new Error("existing Silo is incomplete or inactive; manual repair is required");
+  }
+  const ownerIdentity = organization.memberships[0]!.user.feishuIdentities.find(
+    (identity) => identity.connectionId === organization.feishuApplicationConnection!.id,
+  );
+  if (ownerIdentity?.openId !== ownerOpenId) {
+    throw new Error("bootstrap owner identity does not match the existing Silo");
+  }
+  return {
+    ownerUserId: organization.memberships[0]!.userId,
+    feishuConnectionId: organization.feishuApplicationConnection.id,
+    appIdentityFingerprint: organization.feishuApplicationConnection.appIdentityFingerprint,
+  };
+}
+
+async function loadExistingProviderCredential(
+  prisma: PrismaClient,
+  secrets: LocalSecretEnvelope,
+  organizationId: string,
+  providerId: string,
+): Promise<{ readonly baseUrl: string; readonly authToken: string; readonly anthropicApiKey: string }> {
+  const connection = await prisma.organizationProviderConnection.findUnique({
+    where: { organizationId_providerId: { organizationId, providerId } },
+    include: { activeSecretVersion: true },
+  });
+  const version = connection?.activeSecretVersion;
+  if (connection === null || connection === undefined || version === null || version === undefined ||
+      connection.status !== "ACTIVE" || version.retiredAt !== null) {
+    throw new Error(`active provider connection not found: ${providerId}`);
+  }
+  return decryptStoredProviderCredential(secrets, {
+    organizationId,
+    connectionId: connection.id,
+    providerId,
+    secretVersionId: version.id,
+    envelopeVersion: version.envelopeVersion,
+    keyId: version.keyId,
+    envelope: version.envelope,
+  });
+}
+
+function validateInput(input: AlphaSiloBootstrapInput): AlphaSiloBootstrapInput {
+  const required = (value: string, label: string): string => {
+    const normalized = value.trim();
+    if (normalized === "") throw new Error(`${label} is required`);
+    return normalized;
+  };
+  const slug = required(input.organization.slug, "Organization slug");
+  if (!/^[a-z0-9]([a-z0-9-]*[a-z0-9])?$/.test(slug)) {
+    throw new Error("Organization slug must be lowercase alphanumeric with optional hyphens");
+  }
+  if (input.provider.providerId.trim() !== "openrouter") {
+    throw new Error("Alpha Silo currently requires providerId=openrouter");
+  }
+  return {
+    organization: {
+      id: required(input.organization.id, "Organization id"),
+      slug,
+      name: required(input.organization.name, "Organization name"),
+    },
+    owner: {
+      openId: required(input.owner.openId, "Owner Feishu openId"),
+      displayName: required(input.owner.displayName, "Owner displayName"),
+      ...(input.owner.unionId !== undefined ? { unionId: required(input.owner.unionId, "Owner unionId") } : {}),
+    },
+    feishu: input.feishu,
+    provider: input.provider,
+    ...(input.teams !== undefined
+      ? {
+          teams: input.teams.map((team) => {
+            const teamSlug = required(team.slug, "Team slug");
+            if (!/^[a-z0-9]([a-z0-9-]*[a-z0-9])?$/.test(teamSlug)) {
+              throw new Error(`invalid Team slug: ${teamSlug}`);
+            }
+            return {
+              slug: teamSlug,
+              name: required(team.name, `Team ${teamSlug} name`),
+              ...(team.description !== undefined ? { description: team.description.trim() } : {}),
+            };
+          }),
+        }
+      : {}),
+  };
+}
diff --git a/hub/src/deployment/preflight-cli.ts b/hub/src/deployment/preflight-cli.ts
index 984fff4..14bd374 100644
--- a/hub/src/deployment/preflight-cli.ts
+++ b/hub/src/deployment/preflight-cli.ts
@@ -32,6 +32,7 @@ interface Options {
   readonly stateDir: string;
   readonly cacheDir: string;
   readonly workspaceRoot: string;
+  readonly serviceUnit: string;
   readonly bwrapBin: string;
   readonly socatBin: string;
   readonly pgIsReadyBin: string;
@@ -79,6 +80,7 @@ function deploymentInput(options: Options, env: DeploymentEnv): DeploymentPrefli
     stateDir: options.stateDir,
     cacheDir: options.cacheDir,
     workspaceRoot: options.workspaceRoot,
+    expectedServiceUnit: options.serviceUnit,
     env,
   };
 }
@@ -97,6 +99,7 @@ async function canonicalizeInput(input: DeploymentPreflightInput): Promise<Deplo
     stateDir,
     cacheDir,
     workspaceRoot,
+    expectedServiceUnit: input.expectedServiceUnit,
     env: { ...input.env, HUB_PROJECT_WORKSPACE_ROOT: workspaceRoot },
   };
 }
@@ -155,8 +158,8 @@ async function validateNodeVersion(nodeBin: string): Promise<void> {
   }
   const version = stdout.trim().replace(/^v/, "");
   const major = Number(version.split(".")[0]);
-  if (!Number.isInteger(major) || major < 20) {
-    throw new Error(`Node.js 20 or newer is required; found ${version || "unknown"}`);
+  if (!Number.isInteger(major) || major < 24) {
+    throw new Error(`Node.js 24 or newer is required; found ${version || "unknown"}`);
   }
   console.log(`[preflight] Node.js: ${version}`);
 }
@@ -479,6 +482,7 @@ function parseArgs(argv: readonly string[]): Options {
     "--state-dir",
     "--cache-dir",
     "--workspace-root",
+    "--service-unit",
     "--bwrap-bin",
     "--socat-bin",
     "--pg-isready-bin",
@@ -508,6 +512,7 @@ function parseArgs(argv: readonly string[]): Options {
     stateDir: required(values, "--state-dir"),
     cacheDir: required(values, "--cache-dir"),
     workspaceRoot: required(values, "--workspace-root"),
+    serviceUnit: required(values, "--service-unit"),
     bwrapBin: required(values, "--bwrap-bin"),
     socatBin: required(values, "--socat-bin"),
     pgIsReadyBin: required(values, "--pg-isready-bin"),
diff --git a/hub/src/deployment/preflight.ts b/hub/src/deployment/preflight.ts
index 4e8b864..75cc20e 100644
--- a/hub/src/deployment/preflight.ts
+++ b/hub/src/deployment/preflight.ts
@@ -10,6 +10,7 @@ export interface DeploymentPreflightInput {
   readonly stateDir: string;
   readonly cacheDir: string;
   readonly workspaceRoot: string;
+  readonly expectedServiceUnit: string;
   readonly env: DeploymentEnv;
 }
 
@@ -89,9 +90,13 @@ export function validateDeploymentPreflight(input: DeploymentPreflightInput): De
     }
   }
 
-  readRequired(input.env, "FEISHU_APP_ID", problems);
-  readRequired(input.env, "FEISHU_APP_SECRET", problems);
-  readRequired(input.env, "FEISHU_BOT_OPEN_ID", problems);
+  readRequired(input.env, "HUB_SILO_ORGANIZATION_ID", problems);
+  const serviceUnit = readRequired(input.env, "HUB_SYSTEMD_UNIT", problems);
+  if (serviceUnit !== undefined && !/^cph-hub-[a-z0-9][a-z0-9-]*\.service$/.test(serviceUnit)) {
+    problems.push("HUB_SYSTEMD_UNIT must match cph-hub-<instance>.service");
+  } else if (serviceUnit !== undefined && serviceUnit !== input.expectedServiceUnit) {
+    problems.push(`HUB_SYSTEMD_UNIT must equal installed unit ${input.expectedServiceUnit}`);
+  }
 
   const cphBin = readRequired(input.env, "CPH_BIN", problems);
   if (cphBin !== undefined && !isAbsoluteNormalized(cphBin)) {
@@ -99,6 +104,7 @@ export function validateDeploymentPreflight(input: DeploymentPreflightInput): De
   }
 
   let bind: ServerBinding | undefined;
+  readRequired(input.env, "PORT", problems);
   try {
     bind = readServerBinding(input.env);
   } catch (error) {
@@ -116,6 +122,13 @@ export function validateDeploymentPreflight(input: DeploymentPreflightInput): De
   }
 
   validateOptionalPositiveInteger(input.env, "HUB_AGENT_MAX_TURNS", problems);
+  readRequiredPositiveInteger(input.env, "HUB_AGENT_MAX_CONCURRENT_RUNS", problems);
+  readRequiredPositiveInteger(input.env, "HUB_AGENT_MAX_RUN_SECONDS", problems);
+  readRequiredPositiveInteger(input.env, "HUB_HTTP_BODY_LIMIT_BYTES", problems);
+  readRequiredPositiveInteger(input.env, "HUB_MAX_FILES_PER_MESSAGE", problems);
+  readRequiredPositiveInteger(input.env, "HUB_MAX_FILE_BYTES", problems);
+  readRequiredPositiveInteger(input.env, "HUB_HTTP_REQUESTS_PER_MINUTE", problems);
+  readRequiredPositiveInteger(input.env, "HUB_FEISHU_EVENTS_PER_MINUTE", problems);
   validateOptionalBoolean(input.env, "HUB_FEISHU_LISTENER_ENABLED", problems);
 
   if (problems.length > 0) {
@@ -147,6 +160,14 @@ function validateOptionalPositiveInteger(env: DeploymentEnv, name: string, probl
   }
 }
 
+function readRequiredPositiveInteger(env: DeploymentEnv, name: string, problems: string[]): void {
+  const value = readRequired(env, name, problems);
+  if (value === undefined) return;
+  if (!Number.isInteger(Number(value)) || Number(value) <= 0) {
+    problems.push(`${name} must be a positive integer`);
+  }
+}
+
 function validateOptionalBoolean(env: DeploymentEnv, name: string, problems: string[]): void {
   const raw = env[name]?.trim().toLowerCase();
   if (raw === undefined || raw === "") return;
diff --git a/hub/src/deployment/restore-preflight.ts b/hub/src/deployment/restore-preflight.ts
new file mode 100644
index 0000000..1e81473
--- /dev/null
+++ b/hub/src/deployment/restore-preflight.ts
@@ -0,0 +1,49 @@
+#!/usr/bin/env node
+import { realpath, stat } from "node:fs/promises";
+import { PrismaClient } from "@prisma/client";
+import { verifyStoredFeishuApplicationEnvelopes } from "../connections/feishuApplicationConnections.js";
+import { verifyStoredProviderEnvelopes } from "../connections/providerConnections.js";
+import { loadLocalSecretKeyringFile, LocalSecretEnvelope } from "../security/secretEnvelope.js";
+import { readSiloOrganizationId, requireSiloOrganization } from "./silo.js";
+
+async function main(): Promise<void> {
+  const keyringFile = parseArgs(process.argv.slice(2));
+  const databaseUrl = process.env["DATABASE_URL"]?.trim();
+  const workspaceRoot = process.env["HUB_PROJECT_WORKSPACE_ROOT"]?.trim();
+  if (databaseUrl === undefined || databaseUrl === "") throw new Error("DATABASE_URL is required");
+  if (workspaceRoot === undefined || workspaceRoot === "") throw new Error("HUB_PROJECT_WORKSPACE_ROOT is required");
+  const workspace = await realpath(workspaceRoot);
+  if (!(await stat(workspace)).isDirectory()) throw new Error("restored workspace root is not a directory");
+  const secrets = new LocalSecretEnvelope(await loadLocalSecretKeyringFile(keyringFile));
+  const prisma = new PrismaClient({ datasources: { db: { url: databaseUrl } }, log: [] });
+  try {
+    const organization = await requireSiloOrganization(prisma, readSiloOrganizationId());
+    const provider = await verifyStoredProviderEnvelopes(prisma, secrets);
+    const feishu = await verifyStoredFeishuApplicationEnvelopes(prisma, secrets);
+    const [activeProviders, activeFeishu] = await Promise.all([
+      prisma.organizationProviderConnection.count({
+        where: { organizationId: organization.id, status: "ACTIVE", activeSecretVersionId: { not: null } },
+      }),
+      prisma.organizationFeishuApplicationConnection.count({
+        where: { organizationId: organization.id, status: "ACTIVE", activeSecretVersionId: { not: null } },
+      }),
+    ]);
+    if (activeProviders < 1) throw new Error("restored Silo has no ACTIVE Provider Connection");
+    if (activeFeishu !== 1) throw new Error(`restored Silo must have one ACTIVE Feishu Connection; found ${activeFeishu}`);
+    console.log(JSON.stringify({ organizationId: organization.id, providerEnvelopes: provider, feishuEnvelopes: feishu }));
+  } finally {
+    await prisma.$disconnect();
+  }
+}
+
+function parseArgs(argv: readonly string[]): string {
+  if (argv.length !== 2 || argv[0] !== "--keyring-file" || argv[1] === undefined || argv[1] === "") {
+    throw new Error("usage: restore-preflight --keyring-file /root/recovery/secret-keyring.json");
+  }
+  return argv[1];
+}
+
+main().catch((error: unknown) => {
+  console.error(`[restore-preflight] failed: ${error instanceof Error ? error.message : String(error)}`);
+  process.exitCode = 1;
+});
diff --git a/hub/src/deployment/rotate-secret-kek.ts b/hub/src/deployment/rotate-secret-kek.ts
index 001f498..a1e818e 100644
--- a/hub/src/deployment/rotate-secret-kek.ts
+++ b/hub/src/deployment/rotate-secret-kek.ts
@@ -5,7 +5,6 @@ import { PrismaClient } from "@prisma/client";
 import { rotateLocalKek } from "../security/localKekRotation.js";
 
 const execFileAsync = promisify(execFile);
-const SERVICE_UNIT = "cph-hub.service";
 
 async function main(): Promise<void> {
   if (process.getuid?.() !== 0) {
@@ -30,22 +29,31 @@ async function main(): Promise<void> {
 }
 
 async function requireStoppedService(): Promise<void> {
+  const serviceUnit = readServiceUnit();
   let activeState: string;
   try {
     const { stdout } = await execFileAsync(
       "systemctl",
-      ["show", "--property=ActiveState", "--value", SERVICE_UNIT],
+      ["show", "--property=ActiveState", "--value", serviceUnit],
       { timeout: 10_000 },
     );
     activeState = stdout.trim();
   } catch {
-    throw new Error(`cannot verify that ${SERVICE_UNIT} is stopped`);
+    throw new Error(`cannot verify that ${serviceUnit} is stopped`);
   }
   if (activeState !== "inactive" && activeState !== "failed") {
-    throw new Error(`${SERVICE_UNIT} must be stopped before local KEK rotation; state=${activeState || "unknown"}`);
+    throw new Error(`${serviceUnit} must be stopped before local KEK rotation; state=${activeState || "unknown"}`);
   }
 }
 
+function readServiceUnit(): string {
+  const serviceUnit = process.env["HUB_SYSTEMD_UNIT"]?.trim();
+  if (serviceUnit === undefined || !/^cph-hub-[a-z0-9][a-z0-9-]*\.service$/.test(serviceUnit)) {
+    throw new Error("HUB_SYSTEMD_UNIT must name this Silo unit (cph-hub-<instance>.service)");
+  }
+  return serviceUnit;
+}
+
 function parseKeyringFile(argv: readonly string[]): string {
   if (argv.length !== 2 || argv[0] !== "--keyring-file" || argv[1] === undefined || argv[1] === "") {
     throw new Error("usage: rotate-secret-kek --keyring-file /absolute/path/to/secret-keyring.json");
diff --git a/hub/src/deployment/silo.ts b/hub/src/deployment/silo.ts
new file mode 100644
index 0000000..9825b72
--- /dev/null
+++ b/hub/src/deployment/silo.ts
@@ -0,0 +1,51 @@
+import type { PrismaClient } from "@prisma/client";
+
+export interface SiloOrganization {
+  readonly id: string;
+  readonly slug: string;
+  readonly name: string;
+}
+
+/**
+ * Read the deployment-pinned Organization identity. A Silo process must never
+ * infer its tenant from request data or from whichever row happens to exist.
+ */
+export function readSiloOrganizationId(
+  env: Readonly<Record<string, string | undefined>> = process.env,
+): string {
+  const organizationId = env["HUB_SILO_ORGANIZATION_ID"]?.trim();
+  if (organizationId === undefined || organizationId === "") {
+    throw new Error("HUB_SILO_ORGANIZATION_ID is required");
+  }
+  return organizationId;
+}
+
+/**
+ * Prove the database is a single-tenant Silo before accepting traffic.
+ * Archived rows count too: pointing a Silo process at a pooled or reused
+ * database is a deployment error, not a condition to paper over.
+ */
+export async function requireSiloOrganization(
+  prisma: PrismaClient,
+  organizationId: string,
+): Promise<SiloOrganization> {
+  const [count, organization] = await Promise.all([
+    prisma.organization.count(),
+    prisma.organization.findUnique({
+      where: { id: organizationId },
+      select: { id: true, slug: true, name: true, status: true },
+    }),
+  ]);
+  if (count !== 1) {
+    throw new Error(`Silo database must contain exactly one Organization; found ${count}`);
+  }
+  if (organization === null) {
+    throw new Error(
+      `Silo Organization mismatch: configured ${organizationId} is not the sole database Organization`,
+    );
+  }
+  if (organization.status !== "ACTIVE") {
+    throw new Error(`Silo Organization ${organizationId} is ${organization.status}`);
+  }
+  return { id: organization.id, slug: organization.slug, name: organization.name };
+}
diff --git a/hub/src/deployment/siloRateLimit.ts b/hub/src/deployment/siloRateLimit.ts
new file mode 100644
index 0000000..9eee173
--- /dev/null
+++ b/hub/src/deployment/siloRateLimit.ts
@@ -0,0 +1,25 @@
+export class SiloFixedWindowRateLimiter {
+  private windowStartedAt: number;
+  private used = 0;
+
+  constructor(readonly limit: number, readonly windowMs: number, now = Date.now()) {
+    if (!Number.isSafeInteger(limit) || limit <= 0) throw new Error("rate limit must be a positive integer");
+    if (!Number.isSafeInteger(windowMs) || windowMs <= 0) throw new Error("rate window must be a positive integer");
+    this.windowStartedAt = now;
+  }
+
+  consume(now = Date.now()): { readonly allowed: true } | { readonly allowed: false; readonly retryAfterSeconds: number } {
+    if (now >= this.windowStartedAt + this.windowMs) {
+      this.windowStartedAt = now;
+      this.used = 0;
+    }
+    if (this.used >= this.limit) {
+      return {
+        allowed: false,
+        retryAfterSeconds: Math.max(1, Math.ceil((this.windowStartedAt + this.windowMs - now) / 1000)),
+      };
+    }
+    this.used += 1;
+    return { allowed: true };
+  }
+}
diff --git a/hub/src/feishu/client.ts b/hub/src/feishu/client.ts
index 902b21a..f758a51 100644
--- a/hub/src/feishu/client.ts
+++ b/hub/src/feishu/client.ts
@@ -25,6 +25,7 @@ export interface FeishuConfig {
 export interface FeishuRuntime {
   readonly client: lark.Client;
   readonly logger: FastifyBaseLogger;
+  readonly isListenerReady?: () => boolean;
 }
 
 export interface OutboundPayload {
@@ -494,6 +495,7 @@ export async function downloadMessageFile(
   workspaceDir: string,
   workspaceRelativePath: string,
   resourceType: "image" | "file",
+  maxBytes?: number,
 ): Promise<string> {
   try {
     return await withRetry(async () => {
@@ -509,6 +511,7 @@ export async function downloadMessageFile(
           workspaceDir,
           workspaceRelativePath,
           source,
+          maxBytes,
         );
       } catch (error) {
         source.destroy();
@@ -911,20 +914,41 @@ export function createLarkClient(config: FeishuConfig): lark.Client {
   });
 }
 
-export function startFeishuListenerWithClient(
+export async function startFeishuListenerWithClient(
   config: FeishuConfig,
   client: lark.Client,
   logger: FastifyBaseLogger,
   onMessage: (event: MessageReceiveEvent, rt: FeishuRuntime) => Promise<void>,
   onCardAction?: (event: CardActionEvent, rt: FeishuRuntime) => Promise<void>,
-): FeishuRuntime {
+  onTerminalError?: (error: Error) => void,
+): Promise<FeishuRuntime> {
+  let state: "STARTING" | "READY" | "FAILED" = "STARTING";
+  let resolveReady!: () => void;
+  let rejectReady!: (error: Error) => void;
+  const ready = new Promise<void>((resolve, reject) => {
+    resolveReady = resolve;
+    rejectReady = reject;
+  });
   const wsClient = new lark.WSClient({
     appId: config.appId,
     appSecret: config.appSecret,
     domain: lark.Domain.Feishu,
     loggerLevel: lark.LoggerLevel.info,
+    handshakeTimeoutMs: 10_000,
+    onReady: () => {
+      state = "READY";
+      resolveReady();
+      logger.info("Feishu listener ready");
+    },
+    onError: (error) => {
+      const wasStarting = state === "STARTING";
+      state = "FAILED";
+      logger.error({ err: error }, "Feishu listener terminal failure");
+      if (wasStarting) rejectReady(error);
+      else onTerminalError?.(error);
+    },
   });
-  const rt: FeishuRuntime = { client, logger };
+  const rt: FeishuRuntime = { client, logger, isListenerReady: () => state === "READY" };
   const handlers: Record<string, (data: unknown) => Promise<void>> = {
     "im.message.receive_v1": async (data) => {
       try { await onMessage(data as MessageReceiveEvent, rt); }
@@ -938,15 +962,25 @@ export function startFeishuListenerWithClient(
         .catch((e) => { logger.error({ err: e }, "feishu card action handler threw"); });
     };
   }
-  void wsClient.start({ eventDispatcher: new lark.EventDispatcher({}).register(handlers) });
+  await wsClient.start({ eventDispatcher: new lark.EventDispatcher({}).register(handlers) });
+  let timeout: ReturnType<typeof setTimeout> | undefined;
+  const startupTimeout = new Promise<never>((_resolve, reject) => {
+    timeout = setTimeout(() => reject(new Error("Feishu listener did not become ready within 15 seconds")), 15_000);
+    timeout.unref();
+  });
+  try {
+    await Promise.race([ready, startupTimeout]);
+  } finally {
+    if (timeout !== undefined) clearTimeout(timeout);
+  }
   return rt;
 }
 
-export function startFeishuListener(
+export async function startFeishuListener(
   config: FeishuConfig,
   logger: FastifyBaseLogger,
   onMessage: (event: MessageReceiveEvent, rt: FeishuRuntime) => Promise<void>,
   onCardAction?: (event: CardActionEvent, rt: FeishuRuntime) => Promise<void>,
-): FeishuRuntime {
+): Promise<FeishuRuntime> {
   return startFeishuListenerWithClient(config, createLarkClient(config), logger, onMessage, onCardAction);
 }
diff --git a/hub/src/feishu/identityNamespace.ts b/hub/src/feishu/identityNamespace.ts
new file mode 100644
index 0000000..17156d5
--- /dev/null
+++ b/hub/src/feishu/identityNamespace.ts
@@ -0,0 +1,207 @@
+import { createHash } from "node:crypto";
+import type { Prisma, PrismaClient } from "@prisma/client";
+import { lockActiveOrganization } from "../org/status.js";
+
+export type FeishuPrincipalKind = "USER" | "CHAT" | "DEPARTMENT" | "USER_GROUP" | "EVENT" | "CALLBACK";
+
+export interface ScopedFeishuIdentity {
+  readonly identityId: string;
+  readonly connectionId: string;
+  readonly organizationId: string;
+  readonly userId: string;
+  readonly openId: string;
+  readonly unionId: string | null;
+  readonly principalId: string;
+  readonly displayName: string;
+  readonly avatarUrl: string | null;
+}
+
+export function scopedFeishuPrincipalId(
+  kind: FeishuPrincipalKind,
+  connectionId: string,
+  providerLocalId: string,
+): string {
+  const normalizedConnectionId = nonEmpty(connectionId, "Feishu connectionId");
+  const normalizedProviderLocalId = nonEmpty(providerLocalId, `Feishu ${kind} identifier`);
+  const digest = createHash("sha256")
+    .update("cph-feishu-principal\0")
+    .update(kind, "utf8")
+    .update("\0")
+    .update(normalizedConnectionId, "utf8")
+    .update("\0")
+    .update(normalizedProviderLocalId, "utf8")
+    .digest("base64url");
+  return `feishu:${kind.toLowerCase()}:${normalizedConnectionId}:${digest}`;
+}
+
+export async function upsertScopedFeishuIdentity(
+  prisma: PrismaClient,
+  input: {
+    readonly connectionId: string;
+    readonly openId: string;
+    readonly unionId?: string | undefined;
+    readonly displayName: string;
+    readonly avatarUrl?: string | undefined;
+  },
+): Promise<ScopedFeishuIdentity> {
+  return prisma.$transaction((tx) => upsertScopedFeishuIdentityInTransaction(tx, input));
+}
+
+export async function upsertScopedFeishuIdentityInTransaction(
+  prisma: Prisma.TransactionClient,
+  input: {
+    readonly connectionId: string;
+    readonly expectedOrganizationId?: string | undefined;
+    readonly openId: string;
+    readonly unionId?: string | undefined;
+    readonly displayName: string;
+    readonly avatarUrl?: string | undefined;
+  },
+): Promise<ScopedFeishuIdentity> {
+  const connectionId = nonEmpty(input.connectionId, "Feishu connectionId");
+  const openId = nonEmpty(input.openId, "Feishu openId");
+  const displayName = nonEmpty(input.displayName, "Feishu displayName");
+  const unionId = optionalNonEmpty(input.unionId, "Feishu unionId");
+  const avatarUrl = optionalNonEmpty(input.avatarUrl, "Feishu avatarUrl");
+  const principalId = scopedFeishuPrincipalId("USER", connectionId, openId);
+  const userId = deterministicFeishuUserId(connectionId, openId);
+
+  const connection = await lockActiveConnection(prisma, connectionId);
+  if (input.expectedOrganizationId !== undefined &&
+      input.expectedOrganizationId !== connection.organizationId) {
+    throw new Error("Feishu identity Organization scope mismatch");
+  }
+  const identity = await prisma.feishuUserIdentity.upsert({
+      where: { connectionId_openId: { connectionId, openId } },
+      update: {
+        ...(unionId !== undefined ? { unionId } : {}),
+        user: {
+          update: {
+            displayName,
+            ...(avatarUrl !== undefined ? { avatarUrl } : {}),
+          },
+        },
+      },
+      create: {
+        openId,
+        ...(unionId !== undefined ? { unionId } : {}),
+        connection: { connect: { id: connectionId } },
+        user: {
+          connectOrCreate: {
+            where: { id: userId },
+            create: {
+              id: userId,
+              feishuOpenId: principalId,
+              displayName,
+              ...(avatarUrl !== undefined ? { avatarUrl } : {}),
+            },
+          },
+        },
+      },
+      include: { user: true },
+  });
+  return scopedIdentity(connection.organizationId, identity);
+}
+
+export async function resolveScopedFeishuIdentity(
+  prisma: PrismaClient,
+  input: {
+    readonly connectionId: string;
+    readonly openId: string;
+    readonly expectedOrganizationId?: string | undefined;
+  },
+): Promise<ScopedFeishuIdentity | null> {
+  const connectionId = nonEmpty(input.connectionId, "Feishu connectionId");
+  const openId = nonEmpty(input.openId, "Feishu openId");
+  return prisma.$transaction(async (tx) => {
+    const connection = await lockActiveConnection(tx, connectionId);
+    if (input.expectedOrganizationId !== undefined &&
+        input.expectedOrganizationId !== connection.organizationId) {
+      throw new Error("Feishu identity Organization scope mismatch");
+    }
+    const identity = await tx.feishuUserIdentity.findUnique({
+      where: { connectionId_openId: { connectionId, openId } },
+      include: { user: true },
+    });
+    return identity === null ? null : scopedIdentity(connection.organizationId, identity);
+  });
+}
+
+async function lockActiveConnection(
+  prisma: Prisma.TransactionClient,
+  connectionId: string,
+): Promise<{ readonly organizationId: string }> {
+  const scope = await prisma.organizationFeishuApplicationConnection.findUnique({
+    where: { id: connectionId },
+    select: { organizationId: true },
+  });
+  if (scope === null) throw new Error("active Feishu Application Connection not found");
+  await lockActiveOrganization(prisma, scope.organizationId);
+  await prisma.$queryRaw`
+    SELECT "id" FROM "OrganizationFeishuApplicationConnection"
+    WHERE "id" = ${connectionId} FOR SHARE
+  `;
+  const connection = await prisma.organizationFeishuApplicationConnection.findUnique({
+    where: { id: connectionId },
+    select: {
+      organizationId: true,
+      status: true,
+      activeSecretVersion: { select: { connectionId: true, retiredAt: true } },
+    },
+  });
+  if (connection === null || connection.status !== "ACTIVE" || connection.activeSecretVersion === null ||
+      connection.organizationId !== scope.organizationId ||
+      connection.activeSecretVersion.connectionId !== connectionId ||
+      connection.activeSecretVersion.retiredAt !== null) {
+    throw new Error("active Feishu Application Connection not found");
+  }
+  return { organizationId: connection.organizationId };
+}
+
+function scopedIdentity(
+  organizationId: string,
+  identity: {
+    readonly id: string;
+    readonly connectionId: string;
+    readonly userId: string;
+    readonly openId: string;
+    readonly unionId: string | null;
+    readonly user: {
+      readonly displayName: string;
+      readonly avatarUrl: string | null;
+    };
+  },
+): ScopedFeishuIdentity {
+  return {
+    identityId: identity.id,
+    connectionId: identity.connectionId,
+    organizationId,
+    userId: identity.userId,
+    openId: identity.openId,
+    unionId: identity.unionId,
+    principalId: scopedFeishuPrincipalId("USER", identity.connectionId, identity.openId),
+    displayName: identity.user.displayName,
+    avatarUrl: identity.user.avatarUrl,
+  };
+}
+
+export function deterministicFeishuUserId(connectionId: string, openId: string): string {
+  const digest = createHash("sha256")
+    .update("cph-feishu-user\0")
+    .update(connectionId, "utf8")
+    .update("\0")
+    .update(openId, "utf8")
+    .digest("base64url");
+  return `feishu_${digest}`;
+}
+
+function nonEmpty(value: string, label: string): string {
+  const normalized = value.trim();
+  if (normalized === "") throw new Error(`${label} is required`);
+  return normalized;
+}
+
+function optionalNonEmpty(value: string | undefined, label: string): string | undefined {
+  if (value === undefined) return undefined;
+  return nonEmpty(value, label);
+}
diff --git a/hub/src/feishu/resourceStaging.ts b/hub/src/feishu/resourceStaging.ts
index 7f52223..5ec1869 100644
--- a/hub/src/feishu/resourceStaging.ts
+++ b/hub/src/feishu/resourceStaging.ts
@@ -37,8 +37,12 @@ export async function stageMessageResources(
   messageId: string,
   requests: readonly MessageResourceStageRequest[],
   workspaceRoot: string,
+  limits?: { readonly maxFiles: number; readonly maxBytesPerFile: number },
 ): Promise<StagedMessageResourceBatch | null> {
   if (requests.length === 0) return null;
+  if (limits !== undefined && requests.length > limits.maxFiles) {
+    throw new Error(`Feishu message has ${requests.length} resources; limit is ${limits.maxFiles}`);
+  }
   const stagingBase = await requirePrivateStagingBase(workspaceRoot);
   const stagingRoot = join(stagingBase, randomUUID());
   const resources: StagedMessageResource[] = [];
@@ -53,6 +57,7 @@ export async function stageMessageResources(
         stagingRoot,
         `resource-${index}`,
         request.resourceType,
+        limits?.maxBytesPerFile,
       );
       resources.push({
         resourceType: request.resourceType,
diff --git a/hub/src/feishu/trigger.ts b/hub/src/feishu/trigger.ts
index 56e0ff7..40fd477 100644
--- a/hub/src/feishu/trigger.ts
+++ b/hub/src/feishu/trigger.ts
@@ -68,6 +68,7 @@ import {
   type OnboardingProjectOption,
   type ProjectOnboardingActionValue,
 } from "./projectOnboardingCard.js";
+import { SiloFixedWindowRateLimiter } from "../deployment/siloRateLimit.js";
 
 export { ApprovalManager } from "./approval.js";
 export type { ApprovalResult, PendingApproval } from "./approval.js";
@@ -84,6 +85,15 @@ interface TriggerDeps {
   readonly messageBatcherOptions?: MessageBatcherOptions | undefined;
   readonly triggerQueue?: TriggerQueue | undefined;
   readonly projectWorkspaceRoot: string;
+  /** Alpha Silo policy: never acknowledge work into the process-local queue. */
+  readonly rejectWhenBusy?: boolean | undefined;
+  readonly resourceLimits?: {
+    readonly maxFilesPerMessage: number;
+    readonly maxBytesPerFile: number;
+  } | undefined;
+  readonly allowLegacyFeishuIdentity?: boolean | undefined;
+  /** Alpha Silo aggregate ingress ceiling across message and card events. */
+  readonly maxFeishuEventsPerMinute?: number | undefined;
 }
 
 interface TriggerActor {
@@ -102,6 +112,13 @@ interface TriggerRunContext {
 
 type StartAgentRunOutcome = "started" | "queued" | "rejected" | "locked" | "skipped";
 
+class InstanceCapacityExhaustedError extends Error {
+  constructor(readonly limit: number) {
+    super(`Silo Agent capacity exhausted (${limit} active run(s))`);
+    this.name = "InstanceCapacityExhaustedError";
+  }
+}
+
 export interface TriggerHandler {
   (event: MessageReceiveEvent, rt: FeishuRuntime): Promise<void>;
   readonly onCardAction: (event: CardActionEvent, rt: FeishuRuntime) => Promise<void>;
@@ -120,6 +137,9 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
   const runAgent = deps.runAgent ?? defaultRunAgent;
   const approvalManager = new ApprovalManager();
   const triggerQueue = deps.triggerQueue ?? defaultTriggerQueue;
+  const feishuEventLimiter = deps.maxFeishuEventsPerMinute === undefined
+    ? undefined
+    : new SiloFixedWindowRateLimiter(deps.maxFeishuEventsPerMinute, 60_000);
   const slashCommands = createSlashCommandRegistry({
     prisma: deps.prisma,
     settings: deps.settings,
@@ -162,6 +182,10 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     // ADR-0002: if locked by another run, enqueue the trigger for this project.
     const existing = await currentLockRunId(deps.prisma, projectId);
     if (existing !== null) {
+      if (deps.rejectWhenBusy === true) {
+        await sendText(rt, chatId, "当前项目正在处理中，请稍后重试。", sendOptions);
+        return "rejected";
+      }
       if (!queueIfLocked) return "locked";
       return enqueueLockedTrigger(context, cleanPrompt);
     }
@@ -224,7 +248,12 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
       senderOpenId,
     });
     const senderMetadata = await senderAuditMetadata(rt, senderOpenId);
-    const stagedResources = await stageTriggerMessageResources(rt, msg, projectWorkspaceRoot);
+    const stagedResources = await stageTriggerMessageResources(
+      rt,
+      msg,
+      projectWorkspaceRoot,
+      deps.resourceLimits,
+    );
     const agentPrompt = appendStagedResourcePaths(parsedAgentPrompt, stagedResources, project.workspaceDir);
     const promptForAgent = withFeishuTriggerContext(agentPrompt, feishuTriggerContext);
 
@@ -239,6 +268,11 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     try {
       admission = await deps.prisma.$transaction(async (tx) => {
         await lockActiveOrganization(tx, roleDecision.organizationId);
+        await tx.$executeRaw`SELECT pg_advisory_xact_lock(hashtext('cph-alpha-silo-agent-capacity'))`;
+        const activeRuns = await tx.agentRun.count({ where: { status: "ACTIVE" } });
+        if (activeRuns >= runPolicy.maxConcurrentRuns) {
+          throw new InstanceCapacityExhaustedError(runPolicy.maxConcurrentRuns);
+        }
 
         // ADR-0017: provider+role+model-bound session. Reuse if one exists for
         // this tuple; otherwise create. Role remains part of the key.
@@ -299,9 +333,21 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
         await sendText(rt, chatId, "组织当前不可用，拒绝触发。", sendOptions);
         return "skipped";
       }
+      if (error instanceof InstanceCapacityExhaustedError) {
+        deps.logger.info(
+          { projectId, maxConcurrentRuns: error.limit },
+          "feishu trigger: Silo Agent capacity exhausted",
+        );
+        await sendText(rt, chatId, "当前组织处理任务已满，请稍后重试。", sendOptions);
+        return "rejected";
+      }
       if (!isPrismaUniqueConstraintError(error)) throw error;
       const current = await currentLockRunId(deps.prisma, projectId);
       if (current === null) throw error;
+      if (deps.rejectWhenBusy === true) {
+        await sendText(rt, chatId, "当前项目正在处理中，请稍后重试。", sendOptions);
+        return "rejected";
+      }
       if (!queueIfLocked) return "locked";
       return enqueueLockedTrigger(context, cleanPrompt);
     }
@@ -409,6 +455,12 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     // Abort handle for this run; the interrupt card action calls abort() to
     // stop the SDK query. Cleared in the finally below.
     const abortController = new AbortController();
+    let wallTimeExceeded = false;
+    const wallTimeTimer = setTimeout(() => {
+      wallTimeExceeded = true;
+      abortController.abort("run_wall_time_exceeded");
+    }, runPolicy.maxRunSeconds * 1000);
+    wallTimeTimer.unref();
     activeRuns.set(run.id, abortController);
     const agentExecution = (async () => {
       const providerLease = await provider.openAgentLease({ runId: run.id });
@@ -477,7 +529,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     })();
     agentExecution
       .then(async (result) => {
-        const interrupted = result.status === "interrupted";
+        const interrupted = result.status === "interrupted" && !wallTimeExceeded;
         const finalText =
           result.text !== ""
             ? result.text
@@ -495,7 +547,15 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
         await deps.prisma.agentRun.update({
           where: { id: run.id },
           data: {
-            status: interrupted ? "CANCELED" : result.status === "completed" ? "COMPLETED" : result.status === "length" ? "TIMED_OUT" : "FAILED",
+            status: wallTimeExceeded
+              ? "TIMED_OUT"
+              : interrupted
+                ? "CANCELED"
+                : result.status === "completed"
+                  ? "COMPLETED"
+                  : result.status === "length"
+                    ? "TIMED_OUT"
+                    : "FAILED",
             inputTokens: result.usage.inputTokens,
             outputTokens: result.usage.outputTokens,
             ...(result.costUsd !== undefined ? { costUsd: result.costUsd, costSource: "provider_reported" } : {}),
@@ -528,6 +588,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
         await writeAudit(deps.prisma, { runId: run.id, projectId, action: "run.failed", metadata: { error: String(e) } });
       })
       .finally(async () => {
+        clearTimeout(wallTimeTimer);
         try {
           await releaseLock(deps.prisma, run.id);
         } catch (e) {
@@ -621,6 +682,18 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
   }
 
   const onCardAction = async (event: CardActionEvent, rt: FeishuRuntime): Promise<void> => {
+    const rateDecision = feishuEventLimiter?.consume();
+    if (rateDecision !== undefined && !rateDecision.allowed) {
+      deps.logger.warn(
+        {
+          retryAfterSeconds: rateDecision.retryAfterSeconds,
+          chatId: nonEmpty(event.context?.open_chat_id),
+          operatorOpenId: nonEmpty(event.operator.open_id),
+        },
+        "feishu trigger: Silo event rate exceeded; card action rejected",
+      );
+      return;
+    }
     // Approval buttons (file-delivery / explicit approval cards).
     const approvalAction = approvalActionFromValue(event.action.value);
     if (approvalAction !== null) {
@@ -803,6 +876,28 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
       });
     }
 
+    const rateDecision = feishuEventLimiter?.consume();
+    if (rateDecision !== undefined && !rateDecision.allowed) {
+      deps.logger.warn(
+        {
+          retryAfterSeconds: rateDecision.retryAfterSeconds,
+          chatId: msg.chat_id,
+          messageId: msg.message_id,
+          senderOpenId: event.sender.sender_id.open_id,
+        },
+        "feishu trigger: Silo event rate exceeded; message rejected",
+      );
+      if (msg.chat_id !== "") {
+        await sendText(
+          rt,
+          msg.chat_id,
+          `当前服务请求过多，请约 ${rateDecision.retryAfterSeconds} 秒后重试。`,
+          sendOptionsForTriggerMessage(msg),
+        );
+      }
+      return;
+    }
+
     // Only react to supported inbound message types in group chats.
     if (msg.message_type !== "text" && msg.message_type !== "file" && msg.message_type !== "image" && msg.message_type !== "post") return;
     const chatId = msg.chat_id;
@@ -913,6 +1008,10 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     if (msg.message_type === "text") {
       const existing = await currentLockRunId(deps.prisma, projectId);
       if (existing !== null) {
+        if (deps.rejectWhenBusy === true) {
+          await sendText(rt, chatId, "当前项目正在处理中，请稍后重试。", sendOptionsForTriggerMessage(msg));
+          return;
+        }
         await enqueueLockedTrigger(runContext, cleanPrompt);
         return;
       }
@@ -975,10 +1074,13 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
       }
     | { readonly status: "error"; readonly message: string }
   > {
-    const user = await deps.prisma.user.findUnique({
-      where: { feishuOpenId },
+    const identity = await deps.prisma.feishuUserIdentity.findFirst({
+      where: {
+        openId: feishuOpenId,
+        connection: { status: "ACTIVE", organization: { status: "ACTIVE" } },
+      },
       select: {
-        organizationMemberships: {
+        user: { select: { organizationMemberships: {
           where: {
             revokedAt: null,
             organization: { status: "ACTIVE" },
@@ -988,12 +1090,22 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
             organization: { select: { id: true, name: true } },
           },
           orderBy: { createdAt: "asc" },
-        },
+        } } },
       },
     });
-    if (user === null) {
-      return { status: "error", message: "请先登录并加入组织后，再绑定项目。" };
-    }
+    const user = identity?.user ?? (deps.allowLegacyFeishuIdentity === true
+      ? await deps.prisma.user.findUnique({
+      where: { feishuOpenId },
+      select: {
+        organizationMemberships: {
+          where: { revokedAt: null, organization: { status: "ACTIVE" } },
+          select: { role: true, organization: { select: { id: true, name: true } } },
+          orderBy: { createdAt: "asc" },
+        },
+      },
+      })
+      : null);
+    if (user === null) return { status: "error", message: "请先登录并加入组织后，再绑定项目。" };
     if (user.organizationMemberships.length === 0) {
       return { status: "error", message: "你还不属于任何可用组织，请联系组织管理员。" };
     }
@@ -1378,6 +1490,7 @@ async function stageTriggerMessageResources(
   rt: FeishuRuntime,
   msg: MessageReceiveEvent["message"],
   workspaceRoot: string,
+  limits?: TriggerDeps["resourceLimits"],
 ): Promise<StagedMessageResourceBatch | null> {
   const requests: MessageResourceStageRequest[] = [];
   if (msg.message_type === "post") {
@@ -1407,7 +1520,15 @@ async function stageTriggerMessageResources(
       });
     }
   }
-  return stageMessageResources(rt, msg.message_id, requests, workspaceRoot);
+  return stageMessageResources(
+    rt,
+    msg.message_id,
+    requests,
+    workspaceRoot,
+    limits === undefined
+      ? undefined
+      : { maxFiles: limits.maxFilesPerMessage, maxBytesPerFile: limits.maxBytesPerFile },
+  );
 }
 
 function appendStagedResourcePaths(
diff --git a/hub/src/hub.ts b/hub/src/hub.ts
index 814045b..d809fcb 100644
--- a/hub/src/hub.ts
+++ b/hub/src/hub.ts
@@ -10,7 +10,10 @@ import { createDatabaseRuntimeSettings } from "./settings/runtime.js";
 import { verifyStoredProviderEnvelopes } from "./connections/providerConnections.js";
 import { openProviderProxyLease } from "./connections/providerProxy.js";
 import { verifyStoredFeishuApplicationEnvelopes } from "./connections/feishuApplicationConnections.js";
+import { resolveActiveFeishuApplication } from "./connections/feishuApplicationConnections.js";
 import { readServerBinding } from "./settings/server.js";
+import { readSiloOrganizationId, requireSiloOrganization } from "./deployment/silo.js";
+import { SiloFixedWindowRateLimiter } from "./deployment/siloRateLimit.js";
 
 function requireEnv(name: string): string {
   const value = process.env[name];
@@ -30,7 +33,23 @@ function booleanEnv(name: string, fallback: boolean): boolean {
 export async function startHub(): Promise<void> {
   requireEnv("DATABASE_URL");
   const projectWorkspaceRoot = requireEnv("HUB_PROJECT_WORKSPACE_ROOT");
-  const app = Fastify({ logger: true });
+  const httpBodyLimit = positiveIntegerEnv("HUB_HTTP_BODY_LIMIT_BYTES");
+  const maxFilesPerMessage = positiveIntegerEnv("HUB_MAX_FILES_PER_MESSAGE");
+  const maxBytesPerFile = positiveIntegerEnv("HUB_MAX_FILE_BYTES");
+  const httpRequestsPerMinute = positiveIntegerEnv("HUB_HTTP_REQUESTS_PER_MINUTE");
+  const feishuEventsPerMinute = positiveIntegerEnv("HUB_FEISHU_EVENTS_PER_MINUTE");
+  const app = Fastify({ logger: true, bodyLimit: httpBodyLimit });
+  const requestLimiter = new SiloFixedWindowRateLimiter(httpRequestsPerMinute, 60_000);
+  app.addHook("onRequest", async (request, reply) => {
+    if (request.url === "/api/healthz") return;
+    const decision = requestLimiter.consume();
+    if (!decision.allowed) {
+      await reply
+        .header("Retry-After", String(decision.retryAfterSeconds))
+        .status(429)
+        .send({ error: { code: "rate_limited", message: "Silo request rate exceeded" } });
+    }
+  });
 
   const abandonedStages = await removeAbandonedMessageResourceStages(projectWorkspaceRoot);
   app.log.info({ removed: abandonedStages }, "startup: removed abandoned Feishu resource stages");
@@ -59,9 +78,39 @@ export async function startHub(): Promise<void> {
     }),
   );
 
-  const feishuAppId = requireEnv("FEISHU_APP_ID");
-  const feishuAppSecret = requireEnv("FEISHU_APP_SECRET");
-  const feishuBotOpenId = requireEnv("FEISHU_BOT_OPEN_ID");
+  const siloOrganizationId = readSiloOrganizationId();
+  const siloOrganization = await requireSiloOrganization(prisma, siloOrganizationId);
+  const activeProvider = await prisma.organizationProviderConnection.findUnique({
+    where: {
+      organizationId_providerId: {
+        organizationId: siloOrganization.id,
+        providerId: "openrouter",
+      },
+    },
+    select: {
+      status: true,
+      activeSecretVersion: { select: { connectionId: true, retiredAt: true } },
+      id: true,
+    },
+  });
+  if (activeProvider?.status !== "ACTIVE" || activeProvider.activeSecretVersion === null ||
+      activeProvider.activeSecretVersion.connectionId !== activeProvider.id ||
+      activeProvider.activeSecretVersion.retiredAt !== null) {
+    throw new Error(`Silo Organization ${siloOrganization.id} has no ACTIVE openrouter Provider Connection`);
+  }
+  const feishuApplication = await resolveActiveFeishuApplication(
+    prisma,
+    secretEnvelope,
+    { organizationId: siloOrganization.id },
+  );
+  app.log.info(
+    {
+      organizationId: siloOrganization.id,
+      organizationSlug: siloOrganization.slug,
+      feishuConnectionId: feishuApplication.connectionId,
+    },
+    "startup: proved Silo Organization and resolved Feishu Application",
+  );
   const sessionSecret = requireEnv("HUB_SESSION_SECRET");
   const publicBaseUrl = process.env["HUB_PUBLIC_BASE_URL"] ?? "http://127.0.0.1:8788";
   const bind = readServerBinding();
@@ -74,24 +123,30 @@ export async function startHub(): Promise<void> {
   });
   app.log.info("startup: cleared stale locks + dead runs");
 
-  app.get("/api/healthz", async () => ({ ok: true, ts: Date.now() }));
+  let feishuRuntime: { readonly isListenerReady?: () => boolean } | undefined;
+  app.get("/api/healthz", async (_request, reply) => {
+    const feishuReady = feishuRuntime?.isListenerReady?.() ?? !booleanEnv("HUB_FEISHU_LISTENER_ENABLED", true);
+    if (!feishuReady) return reply.status(503).send({ ok: false, feishuReady, ts: Date.now() });
+    return { ok: true, feishuReady, ts: Date.now() };
+  });
 
   await registerAdminPlugin(app, {
     prisma,
     sessionSecret,
     publicBaseUrl,
-    feishuAppId,
-    feishuAppSecret,
+    feishuAppId: feishuApplication.appId,
+    feishuAppSecret: feishuApplication.appSecret,
     projectWorkspaceRoot,
     secretEnvelope,
   });
 
-  const address = await app.listen(bind);
-  app.log.info({ address }, "hub listening");
-
   const feishuListenerEnabled = booleanEnv("HUB_FEISHU_LISTENER_ENABLED", true);
   if (feishuListenerEnabled) {
-    const feishuConfig = { appId: feishuAppId, appSecret: feishuAppSecret, botOpenId: feishuBotOpenId };
+    const feishuConfig = {
+      appId: feishuApplication.appId,
+      appSecret: feishuApplication.appSecret,
+      botOpenId: feishuApplication.botOpenId,
+    };
     const larkClient = createLarkClient(feishuConfig);
     const triggerQueuePurgeTimer = setInterval(() => {
       const removed = triggerQueue.purgeExpired();
@@ -100,9 +155,37 @@ export async function startHub(): Promise<void> {
       }
     }, 60_000);
     triggerQueuePurgeTimer.unref();
-    const trigger = makeTriggerHandler({ prisma, settings: runtimeSettings, logger: app.log, projectWorkspaceRoot });
-    startFeishuListenerWithClient(feishuConfig, larkClient, app.log, trigger, trigger.onCardAction);
+    const trigger = makeTriggerHandler({
+      prisma,
+      settings: runtimeSettings,
+      logger: app.log,
+      projectWorkspaceRoot,
+      rejectWhenBusy: true,
+      resourceLimits: { maxFilesPerMessage, maxBytesPerFile },
+      allowLegacyFeishuIdentity: false,
+      maxFeishuEventsPerMinute: feishuEventsPerMinute,
+    });
+    feishuRuntime = await startFeishuListenerWithClient(
+      feishuConfig,
+      larkClient,
+      app.log,
+      trigger,
+      trigger.onCardAction,
+      () => {
+        process.exitCode = 1;
+        void app.close().catch((error) => app.log.error({ err: error }, "Hub close after Feishu failure failed"));
+      },
+    );
   } else {
     app.log.info("feishu listener disabled by HUB_FEISHU_LISTENER_ENABLED");
   }
+  const address = await app.listen(bind);
+  app.log.info({ address }, "hub listening");
+}
+
+function positiveIntegerEnv(name: string): number {
+  const raw = requireEnv(name);
+  const value = Number(raw);
+  if (!Number.isSafeInteger(value) || value <= 0) throw new Error(`${name} must be a positive safe integer`);
+  return value;
 }
diff --git a/hub/src/org/members.ts b/hub/src/org/members.ts
index 3f1aab4..2fd7455 100644
--- a/hub/src/org/members.ts
+++ b/hub/src/org/members.ts
@@ -8,11 +8,13 @@
  * 4. ADMIN cannot modify OWNER memberships.
  */
 import type { OrganizationMemberRole, Prisma, PrismaClient } from "@prisma/client";
+import { upsertScopedFeishuIdentityInTransaction } from "../feishu/identityNamespace.js";
 import { lockActiveOrganization } from "./status.js";
 
 export interface OrgMemberRow {
   readonly userId: string;
-  readonly feishuOpenId: string;
+  readonly feishuOpenId: string | null;
+  readonly identityStatus: "SCOPED" | "UNLINKED";
   readonly displayName: string;
   readonly avatarUrl: string | null;
   readonly role: OrganizationMemberRole;
@@ -29,14 +31,24 @@ export async function listOrgMembers(
       role: true,
       createdAt: true,
       user: {
-        select: { id: true, feishuOpenId: true, displayName: true, avatarUrl: true },
+        select: {
+          id: true,
+          displayName: true,
+          avatarUrl: true,
+          feishuIdentities: {
+            where: { connection: { organizationId } },
+            select: { openId: true },
+            take: 1,
+          },
+        },
       },
     },
     orderBy: [{ role: "asc" }, { createdAt: "asc" }],
   });
   return rows.map((row) => ({
     userId: row.user.id,
-    feishuOpenId: row.user.feishuOpenId,
+    feishuOpenId: row.user.feishuIdentities[0]?.openId ?? null,
+    identityStatus: row.user.feishuIdentities.length === 1 ? "SCOPED" : "UNLINKED",
     displayName: row.user.displayName,
     avatarUrl: row.user.avatarUrl,
     role: row.role,
@@ -57,39 +69,47 @@ export async function addOrgMember(
   const openId = requireNonEmpty(input.feishuOpenId, "feishuOpenId");
   assertCanAssignRole(input.actorRole, input.role, /* targetIsOwner */ false);
 
-  const { user, membership } = await prisma.$transaction(async (tx) => {
+  const { identity, membership } = await prisma.$transaction(async (tx) => {
     await lockActiveOrganization(tx, input.organizationId);
-    const user = await tx.user.upsert({
-      where: { feishuOpenId: openId },
-      create: {
-        feishuOpenId: openId,
-        displayName: input.displayName?.trim() || openId,
-      },
-      update: {
-        ...(input.displayName !== undefined && input.displayName.trim() !== ""
-          ? { displayName: input.displayName.trim() }
-          : {}),
+    const connection = await tx.organizationFeishuApplicationConnection.findUnique({
+      where: { organizationId: input.organizationId },
+      select: {
+        id: true,
+        status: true,
+        activeSecretVersion: { select: { connectionId: true, retiredAt: true } },
       },
     });
+    if (connection === null || connection.status !== "ACTIVE" || connection.activeSecretVersion === null ||
+        connection.activeSecretVersion.connectionId !== connection.id ||
+        connection.activeSecretVersion.retiredAt !== null) {
+      throw new Error("active Feishu Application Connection not found");
+    }
+    const identity = await upsertScopedFeishuIdentityInTransaction(tx, {
+      connectionId: connection.id,
+      expectedOrganizationId: input.organizationId,
+      openId,
+      displayName: input.displayName?.trim() || openId,
+    });
     const existing = await tx.organizationMembership.findFirst({
-      where: { organizationId: input.organizationId, userId: user.id, revokedAt: null },
+      where: { organizationId: input.organizationId, userId: identity.userId, revokedAt: null },
     });
-    if (existing !== null) throw new Error(`user ${user.id} is already an active member`);
+    if (existing !== null) throw new Error(`user ${identity.userId} is already an active member`);
     const membership = await tx.organizationMembership.create({
       data: {
         organizationId: input.organizationId,
-        userId: user.id,
+        userId: identity.userId,
         role: input.role,
       },
     });
-    return { user, membership };
+    return { identity, membership };
   });
 
   return {
-    userId: user.id,
-    feishuOpenId: user.feishuOpenId,
-    displayName: user.displayName,
-    avatarUrl: user.avatarUrl,
+    userId: identity.userId,
+    feishuOpenId: identity.openId,
+    identityStatus: "SCOPED",
+    displayName: identity.displayName,
+    avatarUrl: identity.avatarUrl,
     role: membership.role,
     createdAt: membership.createdAt.toISOString(),
   };
@@ -118,7 +138,16 @@ export async function setOrgMemberRole(
         role: true,
         createdAt: true,
         user: {
-          select: { id: true, feishuOpenId: true, displayName: true, avatarUrl: true },
+          select: {
+            id: true,
+            displayName: true,
+            avatarUrl: true,
+            feishuIdentities: {
+              where: { connection: { organizationId: input.organizationId } },
+              select: { openId: true },
+              take: 1,
+            },
+          },
         },
       },
     });
@@ -139,7 +168,8 @@ export async function setOrgMemberRole(
 
     return {
       userId: membership.user.id,
-      feishuOpenId: membership.user.feishuOpenId,
+      feishuOpenId: membership.user.feishuIdentities[0]?.openId ?? null,
+      identityStatus: membership.user.feishuIdentities.length === 1 ? "SCOPED" : "UNLINKED",
       displayName: membership.user.displayName,
       avatarUrl: membership.user.avatarUrl,
       role: updated.role,
diff --git a/hub/src/org/teams.ts b/hub/src/org/teams.ts
index d92d54c..6684afa 100644
--- a/hub/src/org/teams.ts
+++ b/hub/src/org/teams.ts
@@ -168,16 +168,30 @@ export async function listTeamMembers(
     where: { teamId: input.teamId, revokedAt: null },
     select: {
       createdAt: true,
-      user: { select: { id: true, feishuOpenId: true, displayName: true } },
+      user: {
+        select: {
+          id: true,
+          feishuOpenId: true,
+          displayName: true,
+          feishuIdentities: {
+            where: { connection: { organizationId: input.organizationId } },
+            select: { openId: true },
+            take: 1,
+          },
+        },
+      },
     },
     orderBy: { createdAt: "asc" },
   });
-  return rows.map((row) => ({
-    userId: row.user.id,
-    feishuOpenId: row.user.feishuOpenId,
-    displayName: row.user.displayName,
-    createdAt: row.createdAt.toISOString(),
-  }));
+  return rows.map((row) => {
+    const identity = row.user.feishuIdentities[0];
+    return {
+      userId: row.user.id,
+      feishuOpenId: identity?.openId ?? row.user.feishuOpenId,
+      displayName: row.user.displayName,
+      createdAt: row.createdAt.toISOString(),
+    };
+  });
 }
 
 export async function addTeamMember(
@@ -244,23 +258,44 @@ export async function revokeTeamMember(
 
 async function resolveUser(
   prisma: PrismaClient | Prisma.TransactionClient,
-  input: { readonly userId?: string | undefined; readonly feishuOpenId?: string | undefined },
+  input: {
+    readonly organizationId: string;
+    readonly userId?: string | undefined;
+    readonly feishuOpenId?: string | undefined;
+  },
 ): Promise<{ readonly id: string; readonly feishuOpenId: string; readonly displayName: string }> {
   if (input.userId !== undefined && input.userId !== "") {
     const user = await prisma.user.findUnique({
       where: { id: input.userId },
-      select: { id: true, feishuOpenId: true, displayName: true },
+      select: {
+        id: true,
+        feishuOpenId: true,
+        displayName: true,
+        feishuIdentities: {
+          where: { connection: { organizationId: input.organizationId } },
+          select: { openId: true },
+          take: 1,
+        },
+      },
     });
     if (user === null) throw new Error(`user not found: ${input.userId}`);
-    return user;
+    const identity = user.feishuIdentities[0];
+    return {
+      id: user.id,
+      feishuOpenId: identity?.openId ?? user.feishuOpenId,
+      displayName: user.displayName,
+    };
   }
   if (input.feishuOpenId !== undefined && input.feishuOpenId !== "") {
-    const user = await prisma.user.findUnique({
-      where: { feishuOpenId: input.feishuOpenId },
-      select: { id: true, feishuOpenId: true, displayName: true },
+    const identity = await prisma.feishuUserIdentity.findFirst({
+      where: {
+        openId: input.feishuOpenId,
+        connection: { organizationId: input.organizationId, status: "ACTIVE" },
+      },
+      select: { openId: true, user: { select: { id: true, displayName: true } } },
     });
-    if (user === null) throw new Error(`user not found: ${input.feishuOpenId}`);
-    return user;
+    if (identity === null) throw new Error(`user not found in organization: ${input.feishuOpenId}`);
+    return { id: identity.user.id, feishuOpenId: identity.openId, displayName: identity.user.displayName };
   }
   throw new Error("userId or feishuOpenId is required");
 }
diff --git a/hub/src/permissions/principals.ts b/hub/src/permissions/principals.ts
index d392bdc..cfc2f90 100644
--- a/hub/src/permissions/principals.ts
+++ b/hub/src/permissions/principals.ts
@@ -1,4 +1,5 @@
 import type { PrismaClient, PrincipalType } from "@prisma/client";
+import { scopedFeishuPrincipalId } from "../feishu/identityNamespace.js";
 
 export interface PrincipalRef {
   readonly type: PrincipalType;
@@ -40,19 +41,60 @@ export interface PrincipalResolver {
 }
 
 export class PrismaPrincipalResolver implements PrincipalResolver {
-  constructor(private readonly prisma: PrismaClient) {}
+  constructor(
+    private readonly prisma: PrismaClient,
+    private readonly allowLegacyIdentity = process.env["NODE_ENV"] !== "production",
+  ) {}
 
   async resolveActor(actor: ActorInput, scope: PrincipalResolutionScope): Promise<PrincipalResolution> {
     const resolved = new PrincipalCollector();
-    resolved.add({ type: "USER", id: actor.feishuOpenId }, "actor-user");
-    if (actor.chatId !== undefined && actor.chatId !== "") {
-      resolved.add({ type: "FEISHU_CHAT", id: actor.chatId }, "context-chat");
-    }
-
-    const user = await this.prisma.user.findUnique({
-      where: { feishuOpenId: actor.feishuOpenId },
-      select: { id: true },
+    const scopedIdentity = await this.prisma.feishuUserIdentity.findFirst({
+      where: {
+        openId: actor.feishuOpenId,
+        connection: {
+          organizationId: scope.organizationId,
+          status: "ACTIVE",
+          activeSecretVersion: { retiredAt: null },
+        },
+      },
+      select: { userId: true, connectionId: true },
     });
+    // Explicit migration adapter for pre-ADR-0024 fixtures/data. Alpha Silo
+    // ingress always has an ACTIVE connection-scoped identity.
+    const user = scopedIdentity === null && this.allowLegacyIdentity
+      ? await this.prisma.user.findUnique({
+          where: { feishuOpenId: actor.feishuOpenId },
+          select: { id: true },
+        })
+      : scopedIdentity === null ? null : { id: scopedIdentity.userId };
+    const connection = await this.prisma.organizationFeishuApplicationConnection.findUnique({
+      where: { organizationId: scope.organizationId },
+      select: {
+        id: true,
+        status: true,
+        activeSecretVersion: { select: { connectionId: true, retiredAt: true } },
+      },
+    });
+    const activeConnectionId = scopedIdentity?.connectionId ?? (
+      connection?.status === "ACTIVE" && connection.activeSecretVersion !== null &&
+      connection.activeSecretVersion.connectionId === connection.id &&
+      connection.activeSecretVersion.retiredAt === null
+        ? connection.id
+        : undefined
+    );
+    if (activeConnectionId === undefined && !this.allowLegacyIdentity) {
+      throw new Error(`active Feishu Application Connection not found for organization ${scope.organizationId}`);
+    }
+    const userPrincipalId = activeConnectionId === undefined
+      ? actor.feishuOpenId
+      : scopedFeishuPrincipalId("USER", activeConnectionId, actor.feishuOpenId);
+    resolved.add({ type: "USER", id: userPrincipalId }, "actor-user");
+    if (actor.chatId !== undefined && actor.chatId !== "") {
+      const chatPrincipalId = activeConnectionId === undefined
+        ? actor.chatId
+        : scopedFeishuPrincipalId("CHAT", activeConnectionId, actor.chatId);
+      resolved.add({ type: "FEISHU_CHAT", id: chatPrincipalId }, "context-chat");
+    }
 
     if (user !== null) {
       const memberships = await this.prisma.teamMembership.findMany({
diff --git a/hub/src/projectOnboarding.ts b/hub/src/projectOnboarding.ts
index 4ddcfd2..7b0dc57 100644
--- a/hub/src/projectOnboarding.ts
+++ b/hub/src/projectOnboarding.ts
@@ -5,6 +5,7 @@ import type { Folder, OrganizationMemberRole, PermissionRole, Prisma, PrismaClie
 import { createPermissionAuthorizer } from "./permission.js";
 import { writeAudit } from "./audit.js";
 import { lockActiveOrganization, requireActiveOrganizationStatus } from "./org/status.js";
+import { scopedFeishuPrincipalId } from "./feishu/identityNamespace.js";
 
 export interface OrganizationProjectPolicy {
   readonly organizationId: string;
@@ -140,7 +141,8 @@ export async function createProjectFromOrgAdmin(
   return createManagedProject(prisma, {
     organizationId: input.organizationId,
     actorUserId: actor.userId,
-    actorFeishuOpenId: input.actorFeishuOpenId,
+    actorPrincipalId: actor.principalId,
+    feishuConnectionId: actor.connectionId,
     name,
     workspaceRoot: input.workspaceRoot,
     folderId: input.folderId,
@@ -170,7 +172,8 @@ export async function createProjectFromFeishuChat(
   return createManagedProject(prisma, {
     organizationId: input.organizationId,
     actorUserId: actor.userId,
-    actorFeishuOpenId: input.actorFeishuOpenId,
+    actorPrincipalId: actor.principalId,
+    feishuConnectionId: actor.connectionId,
     name,
     workspaceRoot: input.workspaceRoot,
     folderId: input.folderId,
@@ -212,7 +215,7 @@ export async function bindFeishuChatToProject(
     await replaceProjectGrant(tx, {
       projectId: project.id,
       principalType: "FEISHU_CHAT",
-      principalId: chatId,
+      principalId: scopedChatPrincipalId(actor.connectionId, chatId),
       role: "EDIT",
       createdByUserId: actor.userId,
     });
@@ -262,7 +265,7 @@ export async function archiveFeishuChatBinding(
         resourceType: "PROJECT",
         resourceId: binding.projectId,
         principalType: "FEISHU_CHAT",
-        principalId: binding.chatId,
+        principalId: scopedChatPrincipalId(actor.connectionId, binding.chatId),
         revokedAt: null,
       },
       data: { revokedAt: new Date() },
@@ -282,7 +285,8 @@ async function createManagedProject(
   input: {
     readonly organizationId: string;
     readonly actorUserId: string;
-    readonly actorFeishuOpenId: string;
+    readonly actorPrincipalId: string;
+    readonly feishuConnectionId: string | undefined;
     readonly name: string;
     readonly workspaceRoot: string;
     readonly folderId: string | undefined;
@@ -332,7 +336,7 @@ async function createManagedProject(
       await replaceProjectGrant(tx, {
         projectId: created.id,
         principalType: "USER",
-        principalId: input.actorFeishuOpenId,
+        principalId: input.actorPrincipalId,
         role: "MANAGE",
         createdByUserId: input.actorUserId,
       });
@@ -343,7 +347,7 @@ async function createManagedProject(
         await replaceProjectGrant(tx, {
           projectId: created.id,
           principalType: "FEISHU_CHAT",
-          principalId: input.chatId,
+          principalId: scopedChatPrincipalId(input.feishuConnectionId, input.chatId),
           role: "EDIT",
           createdByUserId: input.actorUserId,
         });
@@ -385,7 +389,13 @@ async function requireProjectManager(
   projectId: string,
   organizationId: string,
   actorFeishuOpenId: string,
-): Promise<{ readonly userId: string; readonly role: OrganizationMemberRole; readonly via: "org-admin" | "project-manage" }> {
+): Promise<{
+  readonly userId: string;
+  readonly role: OrganizationMemberRole;
+  readonly principalId: string;
+  readonly connectionId: string | undefined;
+  readonly via: "org-admin" | "project-manage";
+}> {
   const actor = await requireActiveOrgMember(prisma, organizationId, actorFeishuOpenId);
   if (isOrgAdminRole(actor.role)) {
     return { ...actor, via: "org-admin" };
@@ -405,9 +415,42 @@ async function requireActiveOrgMember(
   prisma: PrismaClient,
   organizationId: string,
   feishuOpenId: string,
-): Promise<{ readonly userId: string; readonly role: OrganizationMemberRole }> {
+): Promise<{
+  readonly userId: string;
+  readonly role: OrganizationMemberRole;
+  readonly principalId: string;
+  readonly connectionId: string | undefined;
+}> {
   await requireActiveOrganization(prisma, organizationId);
-  const user = await prisma.user.findUnique({
+  const identity = await prisma.feishuUserIdentity.findFirst({
+    where: { openId: feishuOpenId, connection: { organizationId, status: "ACTIVE" } },
+    select: {
+      connectionId: true,
+      user: { select: {
+        id: true,
+        organizationMemberships: {
+          where: { organizationId, revokedAt: null },
+          select: { role: true },
+          take: 1,
+        },
+      } },
+    },
+  });
+  if (identity !== null) {
+    const membership = identity.user.organizationMemberships[0];
+    if (membership === undefined) {
+      throw new Error(`Feishu user ${feishuOpenId} is not an active member of organization ${organizationId}`);
+    }
+    return {
+      userId: identity.user.id,
+      role: membership.role,
+      principalId: scopedFeishuPrincipalId("USER", identity.connectionId, feishuOpenId),
+      connectionId: identity.connectionId,
+    };
+  }
+  // Explicit compatibility path for pre-ADR-0024 rows while the Silo branch
+  // completes migration. New bootstrap/member writes always create identities.
+  const user = process.env["NODE_ENV"] === "production" ? null : await prisma.user.findUnique({
     where: { feishuOpenId },
     select: {
       id: true,
@@ -425,7 +468,11 @@ async function requireActiveOrgMember(
   if (membership === undefined) {
     throw new Error(`Feishu user ${feishuOpenId} is not an active member of organization ${organizationId}`);
   }
-  return { userId: user.id, role: membership.role };
+  return { userId: user.id, role: membership.role, principalId: feishuOpenId, connectionId: undefined };
+}
+
+function scopedChatPrincipalId(connectionId: string | undefined, chatId: string): string {
+  return connectionId === undefined ? chatId : scopedFeishuPrincipalId("CHAT", connectionId, chatId);
 }
 
 async function ensureOrganizationProjectSettingsTx(
diff --git a/hub/src/security/workspaceFiles.ts b/hub/src/security/workspaceFiles.ts
index 8d78291..20fcaff 100644
--- a/hub/src/security/workspaceFiles.ts
+++ b/hub/src/security/workspaceFiles.ts
@@ -7,7 +7,7 @@ export class WorkspaceFileBoundaryError extends Error {
   constructor(
     message: string,
     readonly requestedPath: string,
-    readonly reason: "not_found" | "boundary" | "io" = "boundary",
+    readonly reason: "not_found" | "boundary" | "io" | "limit" = "boundary",
     options?: ErrorOptions,
   ) {
     super(message, options);
@@ -77,12 +77,14 @@ export async function writeNewWorkspaceFileNoFollow(
   workspaceDir: string,
   requestedPath: string,
   source: Readable,
+  maxBytes?: number,
 ): Promise<string> {
   return (await writeNewWorkspaceFileNoFollowTracked(
     workspaceRoot,
     workspaceDir,
     requestedPath,
     source,
+    maxBytes,
   )).path;
 }
 
@@ -92,6 +94,7 @@ export async function writeNewWorkspaceFileNoFollowTracked(
   workspaceDir: string,
   requestedPath: string,
   source: Readable,
+  maxBytes?: number,
 ): Promise<WorkspaceFileWriteResult> {
   const workspace = await canonicalWorkspace(workspaceRoot, workspaceDir);
   const components = fileComponents(workspace, requestedPath);
@@ -114,8 +117,17 @@ export async function writeNewWorkspaceFileNoFollowTracked(
     const metadata = await file.stat();
     device = metadata.dev;
     inode = metadata.ino;
+    let bytesWritten = 0;
     for await (const chunk of source) {
       const buffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk as Uint8Array);
+      bytesWritten += buffer.length;
+      if (maxBytes !== undefined && bytesWritten > maxBytes) {
+        throw new WorkspaceFileBoundaryError(
+          `inbound file exceeds ${maxBytes} bytes: ${requestedPath}`,
+          requestedPath,
+          "limit",
+        );
+      }
       let offset = 0;
       while (offset < buffer.length) {
         const { bytesWritten } = await file.write(buffer, offset, buffer.length - offset, null);
diff --git a/hub/src/server.ts b/hub/src/server.ts
index 6ab6e45..c8fb8cb 100644
--- a/hub/src/server.ts
+++ b/hub/src/server.ts
@@ -10,7 +10,7 @@
  * Org admin (ADR-0021): Feishu OAuth session + `/api/org/:orgSlug/*`.
  *
  * Env (see .env.example):
- *  DATABASE_URL, FEISHU_APP_ID/SECRET/BOT_OPEN_ID, PORT,
+ *  DATABASE_URL, HUB_SILO_ORGANIZATION_ID, PORT,
  *  HUB_PROJECT_WORKSPACE_ROOT, HUB_SESSION_SECRET, HUB_PUBLIC_BASE_URL.
  * Provider credentials are org-scoped encrypted records; production receives
  * the local master-key keyring only through systemd CREDENTIALS_DIRECTORY.
diff --git a/hub/src/settings/runtime.ts b/hub/src/settings/runtime.ts
index c8a410c..4c11330 100644
--- a/hub/src/settings/runtime.ts
+++ b/hub/src/settings/runtime.ts
@@ -12,6 +12,8 @@ type EnvSource = Env | (() => Env);
 const DEFAULT_SONNET_MODEL = "anthropic/claude-sonnet-5";
 const DEFAULT_SONNET_LABEL = "Claude Sonnet 5";
 const DEFAULT_AGENT_MAX_TURNS = 25;
+const DEFAULT_AGENT_MAX_CONCURRENT_RUNS = 1;
+const DEFAULT_AGENT_MAX_RUN_SECONDS = 900;
 
 export interface ProviderRuntimeSettings {
   readonly id: string;
@@ -43,6 +45,8 @@ export interface RunPolicyInput {
 
 export interface RunPolicy {
   readonly maxTurns: number;
+  readonly maxConcurrentRuns: number;
+  readonly maxRunSeconds: number;
 }
 
 export interface RuntimeSettings {
@@ -75,6 +79,16 @@ export class EnvRuntimeSettings implements RuntimeSettings {
     void input;
     return {
       maxTurns: positiveIntegerEnv(this.envSource(), "HUB_AGENT_MAX_TURNS", DEFAULT_AGENT_MAX_TURNS),
+      maxConcurrentRuns: positiveIntegerEnv(
+        this.envSource(),
+        "HUB_AGENT_MAX_CONCURRENT_RUNS",
+        DEFAULT_AGENT_MAX_CONCURRENT_RUNS,
+      ),
+      maxRunSeconds: positiveIntegerEnv(
+        this.envSource(),
+        "HUB_AGENT_MAX_RUN_SECONDS",
+        DEFAULT_AGENT_MAX_RUN_SECONDS,
+      ),
     };
   }
 }
diff --git a/hub/test/integration/admin-auth.test.ts b/hub/test/integration/admin-auth.test.ts
index 125f514..e0dabd3 100644
--- a/hub/test/integration/admin-auth.test.ts
+++ b/hub/test/integration/admin-auth.test.ts
@@ -9,12 +9,14 @@ import {
   sessionCookieHeader,
 } from "../../src/admin/routes/authRoutes.js";
 import { OAUTH_STATE_COOKIE_NAME, signOAuthState } from "../../src/admin/auth/session.js";
-import { DEFAULT_ORG_ID, prisma, resetDb, testSecretEnvelope } from "./helpers.js";
+import { DEFAULT_ORG_ID, prisma, resetDb, seedTestOrganization, testSecretEnvelope } from "./helpers.js";
+import { FeishuApplicationConnectionService } from "../../src/connections/feishuApplicationConnections.js";
+import { upsertScopedFeishuIdentity } from "../../src/feishu/identityNamespace.js";
 
 const SESSION_SECRET = "integration-test-session-secret";
 const PUBLIC_BASE = "http://127.0.0.1:8788";
 
-async function buildApp(fetchImpl?: typeof fetch) {
+async function buildApp(fetchImpl?: typeof fetch, allowLegacyFeishuOAuth = true) {
   const app = Fastify({ logger: false });
   await registerAdminPlugin(app, {
     prisma,
@@ -24,6 +26,7 @@ async function buildApp(fetchImpl?: typeof fetch) {
     feishuAppSecret: "secret_test",
     projectWorkspaceRoot: "/tmp/cph-test-workspaces",
     secretEnvelope: testSecretEnvelope,
+    allowLegacyFeishuOAuth,
     cookieSecure: false,
     ...(fetchImpl !== undefined ? { fetchImpl } : {}),
   });
@@ -186,6 +189,25 @@ describe("admin auth + org API guards", () => {
     }
   });
 
+  it("does not expose unscoped OAuth when the explicit compatibility switch is off", async () => {
+    const app = await buildApp(undefined, false);
+    try {
+      const start = await app.inject({ method: "GET", url: "/auth/feishu" });
+      expect(start.statusCode).toBe(404);
+      const nonce = "legacy-disabled";
+      const state = signOAuthState({ nonce, returnTo: "/admin" }, SESSION_SECRET);
+      const callback = await app.inject({
+        method: "GET",
+        url: `/auth/feishu/callback?code=ok&state=${encodeURIComponent(state)}`,
+        headers: { cookie: `${OAUTH_STATE_COOKIE_NAME}=${nonce}` },
+      });
+      expect(callback.statusCode).toBe(302);
+      expect(callback.headers.location).toContain("oauth_failed");
+    } finally {
+      await app.close();
+    }
+  });
+
   it("OAuth callback upserts user and sets session cookie", async () => {
     const fetchImpl = vi.fn(async (input: RequestInfo | URL) => {
       const url = String(input);
@@ -230,6 +252,94 @@ describe("admin auth + org API guards", () => {
     }
   });
 
+  it("binds Organization OAuth state, identity, and session to the intended connection", async () => {
+    await seedUser("scoped-owner", "legacy_scoped_owner", "OWNER");
+    const connections = new FeishuApplicationConnectionService(prisma, testSecretEnvelope, async () => {});
+    const connection = await connections.rotateCustomerApplication({
+      organizationId: DEFAULT_ORG_ID,
+      actorUserId: "scoped-owner",
+      appId: "cli_customer_oauth",
+      appSecret: "customer-oauth-secret",
+      botOpenId: "ou_customer_bot",
+    });
+    const identity = await upsertScopedFeishuIdentity(prisma, {
+      connectionId: connection.id,
+      openId: "ou_scoped_user",
+      displayName: "Invited User",
+    });
+    await prisma.organizationMembership.create({
+      data: { organizationId: DEFAULT_ORG_ID, userId: identity.userId, role: "ADMIN" },
+    });
+    await seedTestOrganization("org_scoped_other", "scoped-other");
+    await prisma.organizationMembership.create({
+      data: { organizationId: "org_scoped_other", userId: identity.userId, role: "ADMIN" },
+    });
+    const fetchImpl = vi.fn(async (input: RequestInfo | URL, init?: RequestInit) => {
+      const url = String(input);
+      if (url.includes("/oauth/token")) {
+        expect(JSON.parse(String(init?.body))).toMatchObject({ client_id: "cli_customer_oauth" });
+        return Response.json({ code: 0, access_token: "scoped-user-token" });
+      }
+      if (url.includes("/user_info")) {
+        return Response.json({
+          code: 0,
+          data: {
+            open_id: "ou_scoped_user",
+            union_id: "on_scoped_union",
+            name: "Scoped User",
+          },
+        });
+      }
+      throw new Error(`unexpected ${url}`);
+    });
+    const app = await buildApp(fetchImpl as unknown as typeof fetch);
+    try {
+      const start = await app.inject({
+        method: "GET",
+        url: "/auth/feishu/test-default?returnTo=/admin/org/test-default/settings",
+      });
+      expect(start.statusCode).toBe(302);
+      const authorize = new URL(String(start.headers.location));
+      expect(authorize.searchParams.get("client_id")).toBe("cli_customer_oauth");
+      const state = authorize.searchParams.get("state");
+      expect(state).not.toBeNull();
+      const nonceCookie = cookiePair(start.headers["set-cookie"], OAUTH_STATE_COOKIE_NAME);
+
+      const callback = await app.inject({
+        method: "GET",
+        url: `/auth/feishu/callback?code=ok&state=${encodeURIComponent(state!)}`,
+        headers: { cookie: nonceCookie },
+      });
+      expect(callback.statusCode).toBe(302);
+      expect(callback.headers.location).toBe("/admin/org/test-default/settings");
+      const sessionCookie = cookiePair(callback.headers["set-cookie"], "cph_session");
+      const me = await app.inject({ method: "GET", url: "/api/me", headers: { cookie: sessionCookie } });
+      expect(me.statusCode).toBe(200);
+      expect(me.json()).toMatchObject({
+        user: { id: identity.userId, displayName: "Scoped User" },
+        organizations: [expect.objectContaining({ slug: "test-default", role: "ADMIN" })],
+      });
+      expect((me.json() as { organizations: unknown[] }).organizations).toHaveLength(1);
+      const crossOrganization = await app.inject({
+        method: "GET",
+        url: "/api/org/scoped-other",
+        headers: { cookie: sessionCookie },
+      });
+      expect(crossOrganization.statusCode).toBe(403);
+      expect(crossOrganization.json()).toMatchObject({ error: { code: "forbidden" } });
+      await expect(prisma.feishuUserIdentity.findUniqueOrThrow({
+        where: { id: identity.identityId },
+        select: { unionId: true },
+      })).resolves.toEqual({ unionId: "on_scoped_union" });
+
+      await connections.disable({ organizationId: DEFAULT_ORG_ID, actorUserId: "scoped-owner" });
+      const revoked = await app.inject({ method: "GET", url: "/api/me", headers: { cookie: sessionCookie } });
+      expect(revoked.statusCode).toBe(401);
+    } finally {
+      await app.close();
+    }
+  });
+
   it("unknown org slug returns 404 for admin", async () => {
     await seedUser("u-admin", "ou_admin", "ADMIN");
     const app = await buildApp();
@@ -249,3 +359,10 @@ describe("admin auth + org API guards", () => {
     }
   });
 });
+
+function cookiePair(header: string | string[] | undefined, name: string): string {
+  const values = Array.isArray(header) ? header : [header ?? ""];
+  const cookie = values.find((value) => value.startsWith(`${name}=`));
+  if (cookie === undefined) throw new Error(`missing cookie: ${name}`);
+  return cookie.split(";", 1)[0]!;
+}
diff --git a/hub/test/integration/admin-members-teams.test.ts b/hub/test/integration/admin-members-teams.test.ts
index 34db461..e24c459 100644
--- a/hub/test/integration/admin-members-teams.test.ts
+++ b/hub/test/integration/admin-members-teams.test.ts
@@ -11,6 +11,7 @@ import {
 import { DEFAULT_ORG_ID, prisma, resetDb, testSecretEnvelope } from "./helpers.js";
 import { addOrgMember } from "../../src/org/members.js";
 import { addTeamMember, archiveTeam, createTeam, updateTeam } from "../../src/org/teams.js";
+import { FeishuApplicationConnectionService } from "../../src/connections/feishuApplicationConnections.js";
 
 const SESSION_SECRET = "integration-test-session-secret";
 
@@ -51,6 +52,14 @@ describe("admin members + teams API", () => {
 
   it("adds members and enforces last-OWNER protection", async () => {
     const token = await seedOwner();
+    const connection = await new FeishuApplicationConnectionService(prisma, testSecretEnvelope, async () => {})
+      .rotateCustomerApplication({
+        organizationId: DEFAULT_ORG_ID,
+        actorUserId: "u-owner",
+        appId: "cli_members",
+        appSecret: "members-secret",
+        botOpenId: "ou_members_bot",
+      });
     const app = await buildApp();
     try {
       const cookie = sessionCookieHeader(token);
@@ -64,6 +73,14 @@ describe("admin members + teams API", () => {
       expect(add.statusCode).toBe(201);
       const teacher = add.json() as { userId: string; role: string };
       expect(teacher.role).toBe("ADMIN");
+      await expect(prisma.feishuUserIdentity.findUnique({
+        where: {
+          connectionId_openId: {
+            connectionId: connection.id,
+            openId: "ou_teacher",
+          },
+        },
+      })).resolves.not.toBeNull();
 
       const list = await app.inject({
         method: "GET",
@@ -71,7 +88,18 @@ describe("admin members + teams API", () => {
         headers: { cookie },
       });
       expect(list.statusCode).toBe(200);
-      expect((list.json() as { members: unknown[] }).members).toHaveLength(2);
+      const members = (list.json() as {
+        members: Array<{ userId: string; feishuOpenId: string | null; identityStatus: string }>;
+      }).members;
+      expect(members).toHaveLength(2);
+      expect(members.find((member) => member.userId === "u-owner")).toMatchObject({
+        feishuOpenId: null,
+        identityStatus: "UNLINKED",
+      });
+      expect(members.find((member) => member.userId === teacher.userId)).toMatchObject({
+        feishuOpenId: "ou_teacher",
+        identityStatus: "SCOPED",
+      });
 
       const refuse = await app.inject({
         method: "POST",
diff --git a/hub/test/integration/deployment-preflight-cli.test.ts b/hub/test/integration/deployment-preflight-cli.test.ts
index 1880c1d..97726aa 100644
--- a/hub/test/integration/deployment-preflight-cli.test.ts
+++ b/hub/test/integration/deployment-preflight-cli.test.ts
@@ -18,7 +18,7 @@ import { FeishuApplicationConnectionService } from "../../src/connections/feishu
 const execFileAsync = promisify(execFile);
 const TEST_DATABASE_URL = "postgresql://paradigm:paradigm@127.0.0.1:5432/cph_hub_test";
 
-describe("deployment preflight CLI", () => {
+describe("deployment preflight CLI", { timeout: 20_000 }, () => {
   let root: string;
   let baseDir: string;
   let hubDir: string;
@@ -224,15 +224,21 @@ describe("deployment preflight CLI", () => {
       [
         "NODE_ENV=production",
         `DATABASE_URL=${options.databaseUrl ?? TEST_DATABASE_URL}`,
-        "FEISHU_APP_ID=cli_app_id",
-        "FEISHU_APP_SECRET=feishu-app-secret",
-        "FEISHU_BOT_OPEN_ID=ou_bot",
+        "HUB_SILO_ORGANIZATION_ID=org_test",
+        "HUB_SYSTEMD_UNIT=cph-hub-test.service",
         `CPH_BIN=${cphBin}`,
         "HOST=127.0.0.1",
         "PORT=8788",
         `HUB_PROJECT_WORKSPACE_ROOT=${options.workspaceRoot}`,
         "HUB_PUBLIC_BASE_URL=https://hub.example.com",
         "HUB_SESSION_SECRET=a-production-session-secret-with-32-bytes",
+        "HUB_AGENT_MAX_CONCURRENT_RUNS=1",
+        "HUB_AGENT_MAX_RUN_SECONDS=900",
+        "HUB_HTTP_BODY_LIMIT_BYTES=1048576",
+        "HUB_MAX_FILES_PER_MESSAGE=8",
+        "HUB_MAX_FILE_BYTES=26214400",
+        "HUB_HTTP_REQUESTS_PER_MINUTE=120",
+        "HUB_FEISHU_EVENTS_PER_MINUTE=120",
         "",
       ].join("\n"),
       { mode: 0o600 },
@@ -264,6 +270,8 @@ describe("deployment preflight CLI", () => {
         join(persistentDir, "cache"),
         "--workspace-root",
         options.workspaceRoot,
+        "--service-unit",
+        "cph-hub-test.service",
         "--bwrap-bin",
         bwrapBin,
         "--socat-bin",
diff --git a/hub/test/integration/feishu-identity-namespace.test.ts b/hub/test/integration/feishu-identity-namespace.test.ts
new file mode 100644
index 0000000..e03cf61
--- /dev/null
+++ b/hub/test/integration/feishu-identity-namespace.test.ts
@@ -0,0 +1,132 @@
+import { afterAll, beforeEach, describe, expect, it } from "vitest";
+import { FeishuApplicationConnectionService } from "../../src/connections/feishuApplicationConnections.js";
+import {
+  scopedFeishuPrincipalId,
+  upsertScopedFeishuIdentity,
+  resolveScopedFeishuIdentity,
+} from "../../src/feishu/identityNamespace.js";
+import { DEFAULT_ORG_ID, prisma, resetDb, seedTestOrganization, testSecretEnvelope } from "./helpers.js";
+
+describe("Feishu connection identity namespace", () => {
+  beforeEach(async () => {
+    await resetDb();
+  });
+
+  afterAll(async () => {
+    await prisma.$disconnect();
+  });
+
+  it("keeps colliding provider-local user and chat ids isolated by connection", async () => {
+    const first = await seedConnection(DEFAULT_ORG_ID, "identity-admin-a", "cli_identity_a");
+    await seedTestOrganization("org_identity_other", "identity-other");
+    const second = await seedConnection("org_identity_other", "identity-admin-b", "cli_identity_b");
+
+    const [identityA, identityB] = await Promise.all([
+      upsertScopedFeishuIdentity(prisma, {
+        connectionId: first.id,
+        openId: "ou_collision",
+        displayName: "Teacher A",
+      }),
+      upsertScopedFeishuIdentity(prisma, {
+        connectionId: second.id,
+        openId: "ou_collision",
+        displayName: "Teacher B",
+      }),
+    ]);
+
+    expect(identityA.userId).not.toBe(identityB.userId);
+    expect(identityA.principalId).not.toBe(identityB.principalId);
+    expect(scopedFeishuPrincipalId("CHAT", first.id, "oc_collision"))
+      .not.toBe(scopedFeishuPrincipalId("CHAT", second.id, "oc_collision"));
+    await expect(resolveScopedFeishuIdentity(prisma, {
+      connectionId: first.id,
+      openId: "ou_collision",
+    })).resolves.toMatchObject({ organizationId: DEFAULT_ORG_ID, userId: identityA.userId });
+    await expect(resolveScopedFeishuIdentity(prisma, {
+      connectionId: second.id,
+      openId: "ou_collision",
+    })).resolves.toMatchObject({ organizationId: "org_identity_other", userId: identityB.userId });
+  });
+
+  it("fails closed for an Organization mismatch or disabled connection", async () => {
+    const connection = await seedConnection(DEFAULT_ORG_ID, "identity-owner", "cli_identity");
+    await upsertScopedFeishuIdentity(prisma, {
+      connectionId: connection.id,
+      openId: "ou_teacher",
+      displayName: "Teacher",
+    });
+
+    await expect(resolveScopedFeishuIdentity(prisma, {
+      connectionId: connection.id,
+      expectedOrganizationId: "org_wrong",
+      openId: "ou_teacher",
+    })).rejects.toThrow("scope mismatch");
+    await new FeishuApplicationConnectionService(prisma, testSecretEnvelope, async () => {}).disable({
+      organizationId: DEFAULT_ORG_ID,
+      actorUserId: "identity-owner",
+    });
+    await expect(resolveScopedFeishuIdentity(prisma, {
+      connectionId: connection.id,
+      openId: "ou_teacher",
+    })).rejects.toThrow("active Feishu Application Connection not found");
+  });
+
+  it("serializes identity creation behind a concurrent connection disable", async () => {
+    const connection = await seedConnection(DEFAULT_ORG_ID, "identity-owner", "cli_race");
+    let release!: () => void;
+    const releasePromise = new Promise<void>((resolve) => { release = resolve; });
+    let locked!: () => void;
+    const lockedPromise = new Promise<void>((resolve) => { locked = resolve; });
+    const disabler = prisma.$transaction(async (tx) => {
+      await tx.$queryRaw`
+        SELECT "id" FROM "OrganizationFeishuApplicationConnection"
+        WHERE "id" = ${connection.id} FOR UPDATE
+      `;
+      locked();
+      await releasePromise;
+      await tx.organizationFeishuApplicationConnection.update({
+        where: { id: connection.id },
+        data: { status: "DISABLED", disabledAt: new Date() },
+      });
+    }, { timeout: 10_000 });
+    await lockedPromise;
+
+    const identityAttempt = upsertScopedFeishuIdentity(prisma, {
+      connectionId: connection.id,
+      openId: "ou_racing_user",
+      displayName: "Racing User",
+    });
+    const stateBeforeRelease = await Promise.race([
+      identityAttempt.then(() => "settled", () => "settled"),
+      new Promise<"blocked">((resolve) => setTimeout(() => resolve("blocked"), 50)),
+    ]);
+    expect(stateBeforeRelease).toBe("blocked");
+    release();
+    await disabler;
+    await expect(identityAttempt).rejects.toThrow("active Feishu Application Connection not found");
+    await expect(prisma.feishuUserIdentity.count({
+      where: { connectionId: connection.id, openId: "ou_racing_user" },
+    })).resolves.toBe(0);
+  });
+});
+
+async function seedConnection(
+  organizationId: string,
+  actorUserId: string,
+  appId: string,
+): Promise<{ readonly id: string }> {
+  await prisma.user.create({
+    data: { id: actorUserId, feishuOpenId: `legacy_${actorUserId}`, displayName: actorUserId },
+  });
+  await prisma.organizationMembership.create({
+    data: { organizationId, userId: actorUserId, role: "OWNER" },
+  });
+  return new FeishuApplicationConnectionService(prisma, testSecretEnvelope, async () => {})
+    .rotateCustomerApplication({
+      organizationId,
+      actorUserId,
+      appId,
+      appSecret: `secret_${appId}`,
+      botOpenId: `ou_bot_${appId}`,
+    });
+}
diff --git a/hub/test/integration/helpers.ts b/hub/test/integration/helpers.ts
index 291a594..a1cd403 100644
--- a/hub/test/integration/helpers.ts
+++ b/hub/test/integration/helpers.ts
@@ -36,6 +36,7 @@ export const prisma = new PrismaClient({
 export async function resetDb(): Promise<void> {
   const tables = [
     "FeishuEventReceipt",
+    "FeishuUserIdentity",
     "FeishuApplicationCredentialVersion",
     "OrganizationFeishuApplicationConnection",
     "ProviderCredentialVersion",
diff --git a/hub/test/integration/server-start.test.ts b/hub/test/integration/server-start.test.ts
index 54c1d32..644fdfe 100644
--- a/hub/test/integration/server-start.test.ts
+++ b/hub/test/integration/server-start.test.ts
@@ -4,15 +4,15 @@ import { mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
-import { resetDb, TEST_DATABASE_URL, TEST_SECRET_KEY, TEST_SECRET_KEY_ID } from "./helpers.js";
+import { DEFAULT_ORG_ID, prisma, resetDb, TEST_DATABASE_URL, TEST_SECRET_KEY, TEST_SECRET_KEY_ID, testSecretEnvelope } from "./helpers.js";
+import { FeishuApplicationConnectionService } from "../../src/connections/feishuApplicationConnections.js";
+import { ProviderConnectionService } from "../../src/connections/providerConnections.js";
 
 const ENV_KEYS = [
   "DATABASE_URL",
   "ANTHROPIC_AUTH_TOKEN",
   "ANTHROPIC_API_KEY",
-  "FEISHU_APP_ID",
-  "FEISHU_APP_SECRET",
-  "FEISHU_BOT_OPEN_ID",
+  "HUB_SILO_ORGANIZATION_ID",
   "HUB_PROJECT_WORKSPACE_ROOT",
   "HUB_SESSION_SECRET",
   "HUB_PUBLIC_BASE_URL",
@@ -20,6 +20,13 @@ const ENV_KEYS = [
   "HUB_SECRET_KEYRING_FILE",
   "HOST",
   "PORT",
+  "HUB_HTTP_BODY_LIMIT_BYTES",
+  "HUB_MAX_FILES_PER_MESSAGE",
+  "HUB_MAX_FILE_BYTES",
+  "HUB_AGENT_MAX_CONCURRENT_RUNS",
+  "HUB_AGENT_MAX_RUN_SECONDS",
+  "HUB_HTTP_REQUESTS_PER_MINUTE",
+  "HUB_FEISHU_EVENTS_PER_MINUTE",
 ] as const;
 
 describe("Hub startup", () => {
@@ -34,6 +41,27 @@ describe("Hub startup", () => {
 
   it("rejects startup before the Feishu listener when the HTTP bind fails", async () => {
     await resetDb();
+    const owner = await prisma.user.create({
+      data: {
+        feishuOpenId: "legacy-server-start-owner",
+        displayName: "Server Start Owner",
+        organizationMemberships: { create: { organizationId: DEFAULT_ORG_ID, role: "OWNER" } },
+      },
+    });
+    await new FeishuApplicationConnectionService(prisma, testSecretEnvelope, async () => {}).rotateCustomerApplication({
+      organizationId: DEFAULT_ORG_ID,
+      actorUserId: owner.id,
+      appId: "test-app",
+      appSecret: "test-secret",
+      botOpenId: "ou_test_bot",
+    });
+    await new ProviderConnectionService(prisma, testSecretEnvelope, async () => {}).rotateByok({
+      organizationId: DEFAULT_ORG_ID,
+      actorUserId: owner.id,
+      providerId: "openrouter",
+      baseUrl: "https://openrouter.ai/api",
+      authToken: "test-provider-token",
+    });
     const blocker = createServer();
     blocker.listen(0, "127.0.0.1");
     await once(blocker, "listening");
@@ -50,9 +78,7 @@ describe("Hub startup", () => {
 
     Object.assign(process.env, {
       DATABASE_URL: TEST_DATABASE_URL,
-      FEISHU_APP_ID: "test-app",
-      FEISHU_APP_SECRET: "test-secret",
-      FEISHU_BOT_OPEN_ID: "ou_test_bot",
+      HUB_SILO_ORGANIZATION_ID: DEFAULT_ORG_ID,
       HUB_PROJECT_WORKSPACE_ROOT: "/tmp/cph-hub-server-start-test",
       HUB_SESSION_SECRET: "integration-session-secret-with-32-bytes",
       HUB_PUBLIC_BASE_URL: "https://hub.example.test",
@@ -60,6 +86,13 @@ describe("Hub startup", () => {
       HUB_SECRET_KEYRING_FILE: keyringFile,
       HOST: "127.0.0.1",
       PORT: String(address.port),
+      HUB_HTTP_BODY_LIMIT_BYTES: "1048576",
+      HUB_MAX_FILES_PER_MESSAGE: "8",
+      HUB_MAX_FILE_BYTES: "26214400",
+      HUB_AGENT_MAX_CONCURRENT_RUNS: "1",
+      HUB_AGENT_MAX_RUN_SECONDS: "900",
+      HUB_HTTP_REQUESTS_PER_MINUTE: "120",
+      HUB_FEISHU_EVENTS_PER_MINUTE: "120",
     });
 
     try {
diff --git a/hub/test/integration/silo-bootstrap.test.ts b/hub/test/integration/silo-bootstrap.test.ts
new file mode 100644
index 0000000..e8f91d2
--- /dev/null
+++ b/hub/test/integration/silo-bootstrap.test.ts
@@ -0,0 +1,57 @@
+import { afterAll, beforeEach, describe, expect, it } from "vitest";
+import { bootstrapAlphaSilo } from "../../src/deployment/bootstrap-silo.js";
+import { requireSiloOrganization } from "../../src/deployment/silo.js";
+import { prisma, testSecretEnvelope } from "./helpers.js";
+
+const input = {
+  organization: { id: "org_alpha", slug: "alpha", name: "Alpha School" },
+  owner: { openId: "ou_owner", displayName: "Owner" },
+  feishu: { appId: "cli_alpha", appSecret: "feishu-secret", botOpenId: "ou_bot" },
+  provider: {
+    providerId: "openrouter",
+    baseUrl: "https://openrouter.ai/api",
+    authToken: "provider-secret",
+  },
+  teams: [{ slug: "teachers", name: "Teachers" }],
+} as const;
+
+describe("Alpha Silo bootstrap", () => {
+  beforeEach(async () => {
+    await prisma.$executeRawUnsafe(`TRUNCATE TABLE "Organization" RESTART IDENTITY CASCADE`);
+  });
+
+  afterAll(async () => {
+    await prisma.$disconnect();
+  });
+
+  it("creates one scoped Organization and is idempotent", async () => {
+    const probes = { feishu: async () => {}, provider: async () => {} };
+    const first = await bootstrapAlphaSilo(prisma, testSecretEnvelope, input, probes);
+    const second = await bootstrapAlphaSilo(prisma, testSecretEnvelope, input, probes);
+
+    expect(first).toMatchObject({ organizationId: "org_alpha", initialized: true, providerConfigured: true });
+    expect(second).toMatchObject({ organizationId: "org_alpha", initialized: false, providerConfigured: true });
+    await expect(requireSiloOrganization(prisma, "org_alpha")).resolves.toMatchObject({ slug: "alpha" });
+    expect(await prisma.organization.count()).toBe(1);
+    expect(await prisma.organizationMembership.count({ where: { role: "OWNER", revokedAt: null } })).toBe(1);
+    expect(await prisma.feishuUserIdentity.count()).toBe(1);
+    expect(await prisma.team.count({ where: { slug: "teachers", archivedAt: null } })).toBe(1);
+    expect(await prisma.teamMembership.count({ where: { revokedAt: null } })).toBe(1);
+    expect(await prisma.organizationProviderConnection.count({ where: { status: "ACTIVE" } })).toBe(1);
+
+    const persisted = JSON.stringify({
+      feishu: await prisma.feishuApplicationCredentialVersion.findMany(),
+      provider: await prisma.providerCredentialVersion.findMany(),
+    });
+    expect(persisted).not.toContain("feishu-secret");
+    expect(persisted).not.toContain("provider-secret");
+  });
+
+  it("rejects a configured Organization that does not match the database", async () => {
+    await bootstrapAlphaSilo(prisma, testSecretEnvelope, input, {
+      feishu: async () => {},
+      provider: async () => {},
+    });
+    await expect(requireSiloOrganization(prisma, "org_other")).rejects.toThrow("Silo Organization mismatch");
+  });
+});
diff --git a/hub/test/integration/trigger.test.ts b/hub/test/integration/trigger.test.ts
index 9a506ee..2848cfb 100644
--- a/hub/test/integration/trigger.test.ts
+++ b/hub/test/integration/trigger.test.ts
@@ -22,7 +22,11 @@ type TestTriggerDeps = Omit<Parameters<typeof makeProductionTriggerHandler>[0],
 };
 
 function makeTriggerHandler(deps: TestTriggerDeps): ReturnType<typeof makeProductionTriggerHandler> {
-  return makeProductionTriggerHandler({ projectWorkspaceRoot: "/tmp", ...deps });
+  return makeProductionTriggerHandler({
+    projectWorkspaceRoot: "/tmp",
+    allowLegacyFeishuIdentity: true,
+    ...deps,
+  });
 }
 
 function makeTestSettings(models: InMemoryModelRegistry): RuntimeSettings {
@@ -47,7 +51,7 @@ function makeTestSettings(models: InMemoryModelRegistry): RuntimeSettings {
       return models;
     },
     async runPolicy() {
-      return { maxTurns: 7 };
+      return { maxTurns: 7, maxConcurrentRuns: 4, maxRunSeconds: 300 };
     },
   };
 }
diff --git a/hub/test/unit/deployment-preflight.test.ts b/hub/test/unit/deployment-preflight.test.ts
index d477220..9ec4e98 100644
--- a/hub/test/unit/deployment-preflight.test.ts
+++ b/hub/test/unit/deployment-preflight.test.ts
@@ -8,15 +8,21 @@ import {
 const VALID_ENV = {
   NODE_ENV: "production",
   DATABASE_URL: "postgresql://hub:secret@127.0.0.1:5432/hub",
-  FEISHU_APP_ID: "cli_app_id",
-  FEISHU_APP_SECRET: "feishu-app-secret",
-  FEISHU_BOT_OPEN_ID: "ou_bot",
+  HUB_SILO_ORGANIZATION_ID: "org_test",
+  HUB_SYSTEMD_UNIT: "cph-hub-test.service",
   CPH_BIN: "/srv/curriculum-project-hub/current/bin/cph",
   HOST: "127.0.0.1",
   PORT: "8788",
   HUB_PROJECT_WORKSPACE_ROOT: "/var/lib/cph-hub/workspaces",
   HUB_PUBLIC_BASE_URL: "https://hub.example.com",
   HUB_SESSION_SECRET: "a-production-session-secret-with-32-bytes",
+  HUB_AGENT_MAX_CONCURRENT_RUNS: "1",
+  HUB_AGENT_MAX_RUN_SECONDS: "900",
+  HUB_HTTP_BODY_LIMIT_BYTES: "1048576",
+  HUB_MAX_FILES_PER_MESSAGE: "8",
+  HUB_MAX_FILE_BYTES: "26214400",
+  HUB_HTTP_REQUESTS_PER_MINUTE: "120",
+  HUB_FEISHU_EVENTS_PER_MINUTE: "120",
 } as const;
 
 function input(overrides: Partial<DeploymentPreflightInput> = {}): DeploymentPreflightInput {
@@ -27,6 +33,7 @@ function input(overrides: Partial<DeploymentPreflightInput> = {}): DeploymentPre
     stateDir: "/var/lib/cph-hub/state",
     cacheDir: "/var/cache/cph-hub",
     workspaceRoot: "/var/lib/cph-hub/workspaces",
+    expectedServiceUnit: "cph-hub-test.service",
     env: VALID_ENV,
     ...overrides,
   };
@@ -79,7 +86,7 @@ describe("validateDeploymentPreflight", () => {
         input({
           env: {
             ...VALID_ENV,
-            FEISHU_APP_SECRET: "",
+            HUB_SILO_ORGANIZATION_ID: "",
             HUB_PUBLIC_BASE_URL: "http://hub.example.com",
             HUB_SESSION_SECRET: "short",
           },
@@ -89,7 +96,7 @@ describe("validateDeploymentPreflight", () => {
       expect(error).toBeInstanceOf(DeploymentPreflightError);
       expect((error as Error).message).toMatchInlineSnapshot(`
         "deployment preflight failed:
-        - FEISHU_APP_SECRET is required
+        - HUB_SILO_ORGANIZATION_ID is required
         - HUB_PUBLIC_BASE_URL must use https
         - HUB_SESSION_SECRET must contain at least 32 characters"
       `);
diff --git a/hub/test/unit/feishu-card-action-ack.test.ts b/hub/test/unit/feishu-card-action-ack.test.ts
index fae2ba7..9d9b6f6 100644
--- a/hub/test/unit/feishu-card-action-ack.test.ts
+++ b/hub/test/unit/feishu-card-action-ack.test.ts
@@ -14,8 +14,10 @@ const larkMock = vi.hoisted(() => {
     }
   }
   class MockWSClient {
+    constructor(private readonly params: { readonly onReady?: () => void }) {}
     start(params: { readonly eventDispatcher?: unknown }): void {
       starts.push(params);
+      this.params.onReady?.();
     }
   }
   return { starts, MockEventDispatcher, MockWSClient };
@@ -40,7 +42,7 @@ describe("Feishu card action callbacks", () => {
     const onCardAction = vi.fn(async () => action.promise);
     const logger = silentLogger();
 
-    startFeishuListenerWithClient(
+    await startFeishuListenerWithClient(
       { appId: "app-id", appSecret: "app-secret", botOpenId: "bot-open-id" },
       fakeClient(),
       logger,
@@ -63,7 +65,7 @@ describe("Feishu card action callbacks", () => {
     const logger = silentLogger();
     const err = new Error("handler failed");
 
-    startFeishuListenerWithClient(
+    await startFeishuListenerWithClient(
       { appId: "app-id", appSecret: "app-secret", botOpenId: "bot-open-id" },
       fakeClient(),
       logger,
diff --git a/hub/test/unit/feishu-oauth.test.ts b/hub/test/unit/feishu-oauth.test.ts
index c269165..94887b2 100644
--- a/hub/test/unit/feishu-oauth.test.ts
+++ b/hub/test/unit/feishu-oauth.test.ts
@@ -2,6 +2,7 @@ import { describe, expect, it, vi } from "vitest";
 import {
   buildAuthorizeUrl,
   exchangeCodeForUser,
+  FeishuOAuthError,
   type FeishuOAuthConfig,
 } from "../../src/admin/auth/feishuOAuth.js";
 
@@ -75,13 +76,18 @@ describe("exchangeCodeForUser", () => {
 
   it("throws on token exchange failure", async () => {
     const fetchImpl = vi.fn(async () =>
-      new Response(JSON.stringify({ code: 20003, error: "invalid_grant", error_description: "bad code" }), {
+      new Response(JSON.stringify({
+        code: 20003,
+        error: "invalid_grant",
+        error_description: "echoed app secret s and authorization code bad",
+      }), {
         status: 200,
         headers: { "Content-Type": "application/json" },
       }),
     );
-    await expect(
-      exchangeCodeForUser(
+    let failure: unknown;
+    try {
+      await exchangeCodeForUser(
         {
           appId: "cli",
           appSecret: "s",
@@ -90,7 +96,17 @@ describe("exchangeCodeForUser", () => {
           fetchImpl: fetchImpl as unknown as typeof fetch,
         },
         "bad",
-      ),
-    ).rejects.toThrow(/token exchange failed/);
+      );
+    } catch (error) {
+      failure = error;
+    }
+    expect(failure).toBeInstanceOf(FeishuOAuthError);
+    expect(failure).toMatchObject({
+      code: "feishu_oauth_rejected",
+      category: "provider_rejection",
+      upstreamStatus: 200,
+    });
+    expect(String(failure)).not.toContain("secret s");
+    expect(String(failure)).not.toContain("authorization code bad");
   });
 });
diff --git a/hub/test/unit/feishu-reactions.test.ts b/hub/test/unit/feishu-reactions.test.ts
index e195d13..d5ff71f 100644
--- a/hub/test/unit/feishu-reactions.test.ts
+++ b/hub/test/unit/feishu-reactions.test.ts
@@ -225,7 +225,7 @@ function mockSettings(): RuntimeSettings {
       return registry;
     },
     async runPolicy() {
-      return { maxTurns: 1 };
+      return { maxTurns: 1, maxConcurrentRuns: 1, maxRunSeconds: 300 };
     },
   };
 }
@@ -270,6 +270,7 @@ function mockPrisma(): PrismaClient {
       update: vi.fn(async () => session),
     },
     agentRun: {
+      count: vi.fn(async () => 0),
       create: vi.fn(async () => ({ id: "run-1" })),
       findUnique: vi.fn(async () => null),
       update: vi.fn(async () => ({ id: "run-1" })),
@@ -292,6 +293,7 @@ function mockPrisma(): PrismaClient {
   Object.assign(client, {
     $transaction: vi.fn(async (callback: (tx: PrismaClient) => Promise<unknown>) => callback(client)),
     $queryRaw: vi.fn(async () => [{ id: "org_test_default", status: "ACTIVE" }]),
+    $executeRaw: vi.fn(async () => 1),
   });
   return client;
 }
diff --git a/hub/test/unit/resource-staging.test.ts b/hub/test/unit/resource-staging.test.ts
index 6b67663..9975e8a 100644
--- a/hub/test/unit/resource-staging.test.ts
+++ b/hub/test/unit/resource-staging.test.ts
@@ -2,7 +2,8 @@ import { mkdir, mkdtemp, readdir, rm, symlink, writeFile } from "node:fs/promise
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
-import { removeAbandonedMessageResourceStages } from "../../src/feishu/resourceStaging.js";
+import { removeAbandonedMessageResourceStages, stageMessageResources } from "../../src/feishu/resourceStaging.js";
+import type { FeishuRuntime } from "../../src/feishu/client.js";
 
 const roots: string[] = [];
 
@@ -30,6 +31,20 @@ describe("Feishu resource staging recovery", () => {
       /staging base is not a real directory/,
     );
   });
+
+  it("rejects too many resources before contacting Feishu", async () => {
+    const root = await tempRoot();
+    await expect(stageMessageResources(
+      {} as FeishuRuntime,
+      "message-1",
+      [
+        { fileKey: "a", resourceType: "file", workspaceRelativePath: "a" },
+        { fileKey: "b", resourceType: "file", workspaceRelativePath: "b" },
+      ],
+      root,
+      { maxFiles: 1, maxBytesPerFile: 10 },
+    )).rejects.toThrow("2 resources; limit is 1");
+  });
 });
 
 async function tempRoot(): Promise<string> {
diff --git a/hub/test/unit/runtime-settings.test.ts b/hub/test/unit/runtime-settings.test.ts
index f074b41..a2b7168 100644
--- a/hub/test/unit/runtime-settings.test.ts
+++ b/hub/test/unit/runtime-settings.test.ts
@@ -30,8 +30,14 @@ describe("runtime settings", () => {
   it("honors HUB_AGENT_MAX_TURNS as a runtime run policy", async () => {
     const settings = createEnvRuntimeSettings({
       HUB_AGENT_MAX_TURNS: "9",
+      HUB_AGENT_MAX_CONCURRENT_RUNS: "2",
+      HUB_AGENT_MAX_RUN_SECONDS: "600",
     });
 
-    await expect(settings.runPolicy({ projectId: "p", roleId: "draft" })).resolves.toEqual({ maxTurns: 9 });
+    await expect(settings.runPolicy({ projectId: "p", roleId: "draft" })).resolves.toEqual({
+      maxTurns: 9,
+      maxConcurrentRuns: 2,
+      maxRunSeconds: 600,
+    });
   });
 });
diff --git a/hub/test/unit/session.test.ts b/hub/test/unit/session.test.ts
index 28ca9d8..9baa0b8 100644
--- a/hub/test/unit/session.test.ts
+++ b/hub/test/unit/session.test.ts
@@ -46,6 +46,23 @@ describe("session cookie signing", () => {
     const token = signSession({ userId: "u1", feishuOpenId: "ou_1" }, SECRET);
     expect(verifySession(token, "other-secret")).toBeNull();
   });
+
+  it("round-trips a connection-scoped identity", () => {
+    const token = signSession({
+      userId: "u-scoped",
+      feishuIdentityId: "identity-1",
+      feishuConnectionId: "connection-1",
+      feishuOrganizationId: "organization-1",
+    }, SECRET, 3600, 1_700_000_000);
+    expect(verifySession(token, SECRET, 1_700_000_100)).toEqual({
+      userId: "u-scoped",
+      feishuIdentityId: "identity-1",
+      feishuConnectionId: "connection-1",
+      feishuOrganizationId: "organization-1",
+      iat: 1_700_000_000,
+      exp: 1_700_003_600,
+    });
+  });
 });
 
 describe("oauth state signing", () => {
@@ -62,6 +79,22 @@ describe("oauth state signing", () => {
       exp: 1_700_000_600,
     });
   });
+
+  it("binds state to an Organization and connection as one inseparable scope", () => {
+    const token = signOAuthState({
+      nonce: "scoped",
+      returnTo: "/admin/org/acme",
+      organizationId: "org-acme",
+      connectionId: "connection-acme",
+    }, SECRET, 600, 1_700_000_000);
+    expect(verifyOAuthState(token, SECRET, 1_700_000_100)).toEqual({
+      nonce: "scoped",
+      returnTo: "/admin/org/acme",
+      organizationId: "org-acme",
+      connectionId: "connection-acme",
+      exp: 1_700_000_600,
+    });
+  });
 });
 
 describe("sanitizeReturnTo", () => {
diff --git a/hub/test/unit/silo-rate-limit.test.ts b/hub/test/unit/silo-rate-limit.test.ts
new file mode 100644
index 0000000..98dfb69
--- /dev/null
+++ b/hub/test/unit/silo-rate-limit.test.ts
@@ -0,0 +1,12 @@
+import { describe, expect, it } from "vitest";
+import { SiloFixedWindowRateLimiter } from "../../src/deployment/siloRateLimit.js";
+
+describe("Silo fixed-window rate limiter", () => {
+  it("returns an explicit retry interval and resets at the next window", () => {
+    const limiter = new SiloFixedWindowRateLimiter(2, 60_000, 1_000);
+    expect(limiter.consume(1_000)).toEqual({ allowed: true });
+    expect(limiter.consume(2_000)).toEqual({ allowed: true });
+    expect(limiter.consume(3_000)).toEqual({ allowed: false, retryAfterSeconds: 58 });
+    expect(limiter.consume(61_000)).toEqual({ allowed: true });
+  });
+});
diff --git a/hub/test/unit/workspace-file-limits.test.ts b/hub/test/unit/workspace-file-limits.test.ts
new file mode 100644
index 0000000..917d915
--- /dev/null
+++ b/hub/test/unit/workspace-file-limits.test.ts
@@ -0,0 +1,31 @@
+import { access, mkdir, mkdtemp, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { Readable } from "node:stream";
+import { afterEach, describe, expect, it } from "vitest";
+import { writeNewWorkspaceFileNoFollow } from "../../src/security/workspaceFiles.js";
+
+const roots: string[] = [];
+
+describe("inbound workspace file limits", () => {
+  const itOnLinux = process.platform === "linux" ? it : it.skip;
+  afterEach(async () => {
+    await Promise.all(roots.splice(0).map((root) => rm(root, { recursive: true, force: true })));
+  });
+
+  itOnLinux("fails and removes the partial file when the byte limit is exceeded", async () => {
+    const root = await mkdtemp(join(tmpdir(), "cph-workspace-limit-"));
+    roots.push(root);
+    const workspace = join(root, "project");
+    await mkdir(workspace);
+
+    await expect(writeNewWorkspaceFileNoFollow(
+      root,
+      workspace,
+      "too-large.bin",
+      Readable.from([Buffer.from("1234")]),
+      3,
+    )).rejects.toMatchObject({ reason: "limit" });
+    await expect(access(join(workspace, "too-large.bin"))).rejects.toMatchObject({ code: "ENOENT" });
+  });
+});