diff --git a/.gitea/workflows/deploy-admin.yml b/.gitea/workflows/deploy-admin.yml
new file mode 100644
index 0000000..d86cf5d
--- /dev/null
+++ b/.gitea/workflows/deploy-admin.yml
@@ -0,0 +1,126 @@
+name: deploy admin (hub fleet)
+
+# Rolls Hub releases that include the org-admin SPA (`admin-web` → registerStaticSpa)
+# onto the managed Alpha host. Two fleets share one machine and are separated by
+# the middle DNS label of each Silo's public URL:
+#
+#   dev  → https://<slug>.educraft-dev.paradigm-edu.net   (every push + PR)
+#   prod → https://<slug>.educraft.paradigm-edu.net       (main + tags)
+#
+# Example prod tenant:
+#   https://para-26071100.educraft.paradigm-edu.net/auth/feishu/para-26071100
+#
+# Required Gitea secret:
+#   DEPLOY_SSH_KEY  — private key for root@39.107.254.4
+#
+# Optional secrets / vars (defaults match NEW_SILO_RUNBOOK):
+#   DEPLOY_HOST, DEPLOY_USER, DEPLOY_SSH_PORT, DEPLOY_BASE
+#   vars.ALLOW_EMPTY_FLEET=1  — green when the fleet has no silos yet
+
+on:
+  push:
+    paths:
+      - "hub/**"
+      - ".gitea/workflows/deploy-admin.yml"
+  pull_request:
+    paths:
+      - "hub/**"
+      - ".gitea/workflows/deploy-admin.yml"
+  workflow_dispatch:
+    inputs:
+      fleet:
+        description: "Which fleet to deploy (dev | prod | both)"
+        required: true
+        default: both
+      allow_empty_fleet:
+        description: "Succeed if no silo matches (1/0)"
+        required: false
+        default: "0"
+
+concurrency:
+  group: deploy-admin-host
+  cancel-in-progress: false
+
+jobs:
+  deploy-dev:
+    name: deploy fleet dev (educraft-dev)
+    runs-on: ubuntu-latest
+    if: >
+      github.event_name == 'pull_request' ||
+      (github.event_name == 'push' && !startsWith(github.ref, 'refs/tags/')) ||
+      (github.event_name == 'workflow_dispatch' &&
+        (github.event.inputs.fleet == 'dev' || github.event.inputs.fleet == 'both'))
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Install rsync + ssh
+        run: sudo apt-get update && sudo apt-get install -y rsync openssh-client
+
+      - name: Deploy Hub + admin SPA to educraft-dev fleet
+        env:
+          CPH_FLEET: dev
+          PLATFORM_DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
+          PLATFORM_DEPLOY_USER: ${{ secrets.DEPLOY_USER }}
+          PLATFORM_DEPLOY_PORT: ${{ secrets.DEPLOY_SSH_PORT }}
+          PLATFORM_DEPLOY_BASE: ${{ secrets.DEPLOY_BASE }}
+          PLATFORM_DEPLOY_RELEASE: ${{ github.sha }}
+          ALLOW_EMPTY_FLEET: ${{ github.event.inputs.allow_empty_fleet || vars.ALLOW_EMPTY_FLEET || '0' }}
+          DEPLOY_SSH_KEY_BODY: ${{ secrets.DEPLOY_SSH_KEY }}
+        run: |
+          set -euo pipefail
+          if [ -z "${DEPLOY_SSH_KEY_BODY:-}" ]; then
+            echo "missing secret DEPLOY_SSH_KEY" >&2
+            exit 1
+          fi
+          key="$(mktemp)"
+          trap 'rm -f "$key"' EXIT
+          printf '%s\n' "$DEPLOY_SSH_KEY_BODY" >"$key"
+          chmod 600 "$key"
+          export PLATFORM_DEPLOY_SSH_KEY="$key"
+          # Apply managed-host defaults when secrets are unset.
+          export PLATFORM_DEPLOY_HOST="${PLATFORM_DEPLOY_HOST:-39.107.254.4}"
+          export PLATFORM_DEPLOY_USER="${PLATFORM_DEPLOY_USER:-root}"
+          export PLATFORM_DEPLOY_PORT="${PLATFORM_DEPLOY_PORT:-22}"
+          export PLATFORM_DEPLOY_BASE="${PLATFORM_DEPLOY_BASE:-/srv/curriculum-project-hub}"
+          bash hub/deploy/deploy_fleet_release.sh
+
+  deploy-prod:
+    name: deploy fleet prod (educraft)
+    runs-on: ubuntu-latest
+    if: >
+      (github.event_name == 'push' && github.ref == 'refs/heads/main') ||
+      (github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')) ||
+      (github.event_name == 'workflow_dispatch' &&
+        (github.event.inputs.fleet == 'prod' || github.event.inputs.fleet == 'both'))
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Install rsync + ssh
+        run: sudo apt-get update && sudo apt-get install -y rsync openssh-client
+
+      - name: Deploy Hub + admin SPA to educraft fleet
+        env:
+          CPH_FLEET: prod
+          PLATFORM_DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
+          PLATFORM_DEPLOY_USER: ${{ secrets.DEPLOY_USER }}
+          PLATFORM_DEPLOY_PORT: ${{ secrets.DEPLOY_SSH_PORT }}
+          PLATFORM_DEPLOY_BASE: ${{ secrets.DEPLOY_BASE }}
+          PLATFORM_DEPLOY_RELEASE: ${{ github.sha }}
+          ALLOW_EMPTY_FLEET: ${{ github.event.inputs.allow_empty_fleet || vars.ALLOW_EMPTY_FLEET || '0' }}
+          DEPLOY_SSH_KEY_BODY: ${{ secrets.DEPLOY_SSH_KEY }}
+        run: |
+          set -euo pipefail
+          if [ -z "${DEPLOY_SSH_KEY_BODY:-}" ]; then
+            echo "missing secret DEPLOY_SSH_KEY" >&2
+            exit 1
+          fi
+          key="$(mktemp)"
+          trap 'rm -f "$key"' EXIT
+          printf '%s\n' "$DEPLOY_SSH_KEY_BODY" >"$key"
+          chmod 600 "$key"
+          export PLATFORM_DEPLOY_SSH_KEY="$key"
+          export PLATFORM_DEPLOY_HOST="${PLATFORM_DEPLOY_HOST:-39.107.254.4}"
+          export PLATFORM_DEPLOY_USER="${PLATFORM_DEPLOY_USER:-root}"
+          export PLATFORM_DEPLOY_PORT="${PLATFORM_DEPLOY_PORT:-22}"
+          export PLATFORM_DEPLOY_BASE="${PLATFORM_DEPLOY_BASE:-/srv/curriculum-project-hub}"
+          bash hub/deploy/deploy_fleet_release.sh
diff --git a/hub/deploy/README.md b/hub/deploy/README.md
index 4e766e9..9bffc37 100644
--- a/hub/deploy/README.md
+++ b/hub/deploy/README.md
@@ -11,6 +11,32 @@ See [NEW_SILO_RUNBOOK.md](NEW_SILO_RUNBOOK.md). The remainder of this document
 describes the individual installer and maintenance primitives used by the
 generated bundle.
 
+## CI: roll Hub + admin SPA by fleet (`educraft` / `educraft-dev`)
+
+`.gitea/workflows/deploy-admin.yml` deploys Hub releases (including the org-admin
+SPA) to the managed Alpha host via `deploy_fleet_release.sh`. Fleets share the
+host and are selected by the middle DNS label of `HUB_PUBLIC_BASE_URL`:
+
+| Fleet | Domain | CI trigger |
+|-------|--------|------------|
+| **dev** | `https://<slug>.educraft-dev.paradigm-edu.net` | every push + PR (paths under `hub/`) |
+| **prod** | `https://<slug>.educraft.paradigm-edu.net` | push to `main` + tags |
+
+Example prod tenant:
+`https://para-26071100.educraft.paradigm-edu.net/auth/feishu/para-26071100`.
+
+Required Gitea secret: `DEPLOY_SSH_KEY` (private key for `root@39.107.254.4`).
+Optional: `DEPLOY_HOST` / `DEPLOY_USER` / `DEPLOY_SSH_PORT` / `DEPLOY_BASE`.
+Set repository var `ALLOW_EMPTY_FLEET=1` until the first silo exists for a fleet.
+
+Local dry-run against the host:
+
+```sh
+CPH_FLEET=dev \
+  PLATFORM_DEPLOY_SSH_KEY=$HOME/.ssh/id_ed25519 \
+  bash hub/deploy/deploy_fleet_release.sh
+```
+
 The supervised alpha runs one Organization per named Silo. The supported host
 has systemd, PostgreSQL, Node.js 24+, `pg_isready`, `runuser`, `setpriv`,
 bubblewrap, `socat`, `pg_dump`, `tar`, `sha256sum`, and a compatible `cph`.
diff --git a/hub/deploy/deploy_fleet_release.sh b/hub/deploy/deploy_fleet_release.sh
new file mode 100755
index 0000000..1174cc2
--- /dev/null
+++ b/hub/deploy/deploy_fleet_release.sh
@@ -0,0 +1,213 @@
+#!/usr/bin/env bash
+# Publish one immutable Hub release (tsc + admin-web SPA) to the managed host,
+# then repoint every Silo in the chosen fleet to that release and restart it.
+#
+# Fleet is selected by the middle DNS label of each Silo's HUB_PUBLIC_BASE_URL:
+#
+#   prod → https://<slug>.educraft.paradigm-edu.net
+#   dev  → https://<slug>.educraft-dev.paradigm-edu.net
+#
+# Example tenant (prod):
+#   https://para-26071100.educraft.paradigm-edu.net/auth/feishu/para-26071100
+#
+# Configure (CI secrets / env):
+#   CPH_FLEET                 required: dev | prod
+#   PLATFORM_DEPLOY_HOST      default 39.107.254.4
+#   PLATFORM_DEPLOY_USER      default root
+#   PLATFORM_DEPLOY_SSH_KEY   required (path to private key)
+#   PLATFORM_DEPLOY_PORT      default 22
+#   PLATFORM_DEPLOY_BASE      default /srv/curriculum-project-hub
+#   PLATFORM_DEPLOY_RELEASE   default git HEAD (must be safe for paths)
+#   ALLOW_EMPTY_FLEET         optional: if 1, succeed when no silo matches
+#
+# This is a code-roll for existing silos. It does not create databases, domains,
+# or Feishu apps — use new_silo.sh / apply_new_silo.sh for that.
+set -euo pipefail
+
+FLEET="${CPH_FLEET:?CPH_FLEET required (dev|prod)}"
+case "$FLEET" in
+  dev) FLEET_DOMAIN_SUFFIX="educraft-dev.paradigm-edu.net" ;;
+  prod) FLEET_DOMAIN_SUFFIX="educraft.paradigm-edu.net" ;;
+  *)
+    echo "CPH_FLEET must be dev or prod, got: $FLEET" >&2
+    exit 1
+    ;;
+esac
+
+HOST="${PLATFORM_DEPLOY_HOST:-39.107.254.4}"
+DEPLOY_USER="${PLATFORM_DEPLOY_USER:-root}"
+PORT="${PLATFORM_DEPLOY_PORT:-22}"
+SSH_KEY="${PLATFORM_DEPLOY_SSH_KEY:?PLATFORM_DEPLOY_SSH_KEY required}"
+BASE="${PLATFORM_DEPLOY_BASE:-/srv/curriculum-project-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: $RELEASE_ID" >&2
+  exit 1
+}
+ALLOW_EMPTY_FLEET="${ALLOW_EMPTY_FLEET:-0}"
+
+HUB_DIR="$BASE/releases/$RELEASE_ID/hub"
+RELEASE_DIR="$BASE/releases/$RELEASE_ID"
+SSH_OPTS=(-i "$SSH_KEY" -p "$PORT" -o BatchMode=yes -o StrictHostKeyChecking=accept-new)
+
+echo "[fleet] fleet=$FLEET domain=*.$FLEET_DOMAIN_SUFFIX host=$DEPLOY_USER@$HOST release=$RELEASE_ID"
+
+# --- 1. Publish immutable release (shared; flock so parallel fleet jobs do not race) ---
+release_ready=false
+if ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "test -f '$RELEASE_DIR/.complete'"; then
+  release_ready=true
+  echo "[fleet] release already complete: $RELEASE_DIR"
+fi
+
+if [ "$release_ready" = false ]; then
+  echo "[fleet] rsync hub → $HUB_DIR"
+  ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" \
+    "flock /var/lock/cph-hub-release-publish mkdir -p '$HUB_DIR'"
+
+  rsync -az --delete \
+    --exclude node_modules --exclude dist --exclude .env \
+    --exclude admin-web/node_modules --exclude admin-web/build --exclude admin-web/.svelte-kit \
+    -e "ssh ${SSH_OPTS[*]}" \
+    "$REPO_ROOT/hub/" "$DEPLOY_USER@$HOST:$HUB_DIR/"
+
+  echo "[fleet] npm ci + build (tsc + admin-web SPA)"
+  ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" bash -s <<REMOTE
+set -euo pipefail
+flock /var/lock/cph-hub-release-publish bash -c '
+  set -euo pipefail
+  if [ -f "$RELEASE_DIR/.complete" ]; then
+    echo "[fleet] release completed by another job"
+    exit 0
+  fi
+  if [ -e "$RELEASE_DIR" ] && [ ! -f "$RELEASE_DIR/.complete" ] && [ ! -d "$HUB_DIR" ]; then
+    echo "incomplete release tree: $RELEASE_DIR" >&2
+    exit 1
+  fi
+  cd "$HUB_DIR"
+  npm ci
+  npm ci --prefix admin-web
+  npm run audit:production
+  npm run build
+  test -f admin-web/build/index.html
+  touch "$RELEASE_DIR/.complete"
+'
+REMOTE
+fi
+
+# --- 2. Discover silos in this fleet and roll them onto the release ---
+ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" \
+  env BASE="$BASE" HUB_DIR="$HUB_DIR" FLEET="$FLEET" \
+  FLEET_DOMAIN_SUFFIX="$FLEET_DOMAIN_SUFFIX" ALLOW_EMPTY_FLEET="$ALLOW_EMPTY_FLEET" \
+  bash -s <<'REMOTE'
+set -euo pipefail
+
+fleet_match() {
+  local public_url="$1"
+  local host="${public_url#https://}"
+  host="${host#http://}"
+  host="${host%%/*}"
+  host="${host%%:*}"
+  case "$FLEET" in
+    prod)
+      [[ "$host" == *."$FLEET_DOMAIN_SUFFIX" || "$host" == "$FLEET_DOMAIN_SUFFIX" ]] || return 1
+      # Avoid matching educraft-dev when suffix is educraft.…
+      [[ "$host" != *.educraft-dev.paradigm-edu.net && "$host" != educraft-dev.paradigm-edu.net ]] || return 1
+      return 0
+      ;;
+    dev)
+      [[ "$host" == *."$FLEET_DOMAIN_SUFFIX" || "$host" == "$FLEET_DOMAIN_SUFFIX" ]]
+      return
+      ;;
+    *)
+      return 1
+      ;;
+  esac
+}
+
+env_value() {
+  local file="$1"
+  local key="$2"
+  # Do not source secrets — only read the KEY=value line.
+  local line
+  line="$(grep -E "^${key}=" "$file" | tail -n1 || true)"
+  printf '%s' "${line#"${key}="}"
+}
+
+matched=0
+shopt -s nullglob
+for env_file in "$BASE"/.secrets/*/platform.env; do
+  instance_id="$(basename "$(dirname "$env_file")")"
+  public_url="$(env_value "$env_file" HUB_PUBLIC_BASE_URL)"
+  if [ -z "$public_url" ]; then
+    echo "[fleet] skip $instance_id: HUB_PUBLIC_BASE_URL empty"
+    continue
+  fi
+  if ! fleet_match "$public_url"; then
+    echo "[fleet] skip $instance_id: $public_url (not $FLEET)"
+    continue
+  fi
+
+  port="$(env_value "$env_file" PORT)"
+  workspace="$(env_value "$env_file" HUB_PROJECT_WORKSPACE_ROOT)"
+  unit="cph-hub-${instance_id}.service"
+  if [ ! -f "/etc/systemd/system/$unit" ]; then
+    echo "[fleet] skip $instance_id: unit missing ($unit)" >&2
+    continue
+  fi
+
+  # Prefer unit file ceilings (MemoryMax=16G) over systemctl's byte form.
+  memory_max="$(sed -n 's/^MemoryMax=//p' "/etc/systemd/system/$unit" | tail -n1)"
+  cpu_quota="$(sed -n 's/^CPUQuota=//p' "/etc/systemd/system/$unit" | tail -n1)"
+  tasks_max="$(sed -n 's/^TasksMax=//p' "/etc/systemd/system/$unit" | tail -n1)"
+
+  if [ -z "$port" ] || [ -z "$workspace" ] || [ -z "$memory_max" ] || [ -z "$cpu_quota" ] || [ -z "$tasks_max" ]; then
+    echo "[fleet] error: $instance_id missing PORT/workspace/ceilings (port=$port workspace=$workspace memory=$memory_max cpu=$cpu_quota tasks=$tasks_max)" >&2
+    exit 1
+  fi
+
+  echo "[fleet] roll $instance_id → $HUB_DIR ($public_url port=$port)"
+  BASE="$BASE" \
+    HUB_DIR="$HUB_DIR" \
+    INSTANCE_ID="$instance_id" \
+    WORKSPACE_ROOT="$workspace" \
+    PORT="$port" \
+    MEMORY_MAX="$memory_max" \
+    CPU_QUOTA="$cpu_quota" \
+    TASKS_MAX="$tasks_max" \
+    bash "$HUB_DIR/deploy/install_service.sh"
+
+  systemctl restart "$unit"
+  systemctl is-active --quiet "$unit"
+
+  health="http://127.0.0.1:${port}/api/healthz"
+  ok=false
+  for _ in $(seq 1 45); do
+    if curl --fail --silent "$health" >/dev/null 2>&1; then
+      ok=true
+      break
+    fi
+    sleep 1
+  done
+  if [ "$ok" != true ]; then
+    curl --fail --silent --show-error "$health" >/dev/null
+  fi
+  echo "[fleet] healthy $instance_id ($health)"
+  matched=$((matched + 1))
+done
+
+if [ "$matched" -eq 0 ]; then
+  msg="[fleet] no silos matched *.$FLEET_DOMAIN_SUFFIX under $BASE/.secrets"
+  if [ "$ALLOW_EMPTY_FLEET" = "1" ]; then
+    echo "$msg (ALLOW_EMPTY_FLEET=1)"
+    exit 0
+  fi
+  echo "$msg" >&2
+  exit 1
+fi
+
+echo "[fleet] rolled $matched silo(s) on $FLEET"
+REMOTE
+
+echo "[fleet] done fleet=$FLEET release=$RELEASE_ID hub=$HUB_DIR"