fix: restore bounded agent sandbox execution

hub/deploy/README.md

@@ -15,6 +15,7 @@ Application code lives in immutable versioned directories under
 sudo BASE=/srv/curriculum-project-hub \
   HUB_DIR=/srv/curriculum-project-hub/releases/<release-id>/hub \
   INSTANCE_ID=org-a \
+  WORKSPACE_ROOT=/w/997 \
   PORT=8788 \
   MEMORY_MAX=16G CPU_QUOTA=400% TASKS_MAX=512 \
   bash /srv/curriculum-project-hub/releases/<release-id>/hub/deploy/install_service.sh
@@ -49,7 +50,7 @@ Default state paths are:
 ```text
 /var/lib/cph-hub/org-a/home
 /var/lib/cph-hub/org-a/state
-/var/lib/cph-hub/org-a/workspaces
+/w/997
 /var/cache/cph-hub/org-a
 ```
 

hub/deploy/deploy_platform.sh

@@ -10,6 +10,7 @@
 #   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_WORKSPACE_ROOT required short per-Silo path (for example /w/997)
 #   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 24+, npm, rsync, PostgreSQL client tools
@@ -31,6 +32,7 @@ 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="${PLATFORM_DEPLOY_INSTANCE:?PLATFORM_DEPLOY_INSTANCE required}"
+WORKSPACE_ROOT="${PLATFORM_DEPLOY_WORKSPACE_ROOT:?PLATFORM_DEPLOY_WORKSPACE_ROOT required}"
 SERVICE_UNIT="cph-hub-$INSTANCE_ID.service"
 MEMORY_MAX="${PLATFORM_DEPLOY_MEMORY_MAX:?PLATFORM_DEPLOY_MEMORY_MAX required}"
 CPU_QUOTA="${PLATFORM_DEPLOY_CPU_QUOTA:?PLATFORM_DEPLOY_CPU_QUOTA required}"
@@ -67,11 +69,11 @@ fi
 ssh "${SSH_OPTS[@]}" "$DEPLOY_USER@$HOST" "
   set -euo pipefail
   if [ \"\$(id -u)\" = \"0\" ]; then
-    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'
+    BASE='$BASE' HUB_DIR='$HUB_DIR' INSTANCE_ID='$INSTANCE_ID' WORKSPACE_ROOT='$WORKSPACE_ROOT' 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='$HUB_DIR' INSTANCE_ID='$INSTANCE_ID' PORT='$HUB_PORT' MEMORY_MAX='$MEMORY_MAX' CPU_QUOTA='$CPU_QUOTA' TASKS_MAX='$TASKS_MAX' bash '$HUB_DIR/deploy/install_service.sh'
+    sudo -n BASE='$BASE' HUB_DIR='$HUB_DIR' INSTANCE_ID='$INSTANCE_ID' WORKSPACE_ROOT='$WORKSPACE_ROOT' PORT='$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

hub/deploy/install_service.sh

@@ -23,7 +23,7 @@ SERVICE_GROUP="${SERVICE_GROUP:-$SERVICE_USER}"
 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}"
+WORKSPACE_ROOT="${WORKSPACE_ROOT:?WORKSPACE_ROOT required (use a short per-Silo path such as /w/997)}"
 HOST="${HOST:-127.0.0.1}"
 PORT="${PORT:?PORT is required and must be unique on the host}"
 ENV_FILE="${ENV_FILE:-$BASE/.secrets/$INSTANCE_ID/platform.env}"
@@ -120,6 +120,7 @@ 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"
+[ "${#WORKSPACE_ROOT}" -le 16 ] || fail "WORKSPACE_ROOT must be at most 16 bytes for Agent sandbox sockets: $WORKSPACE_ROOT"
 
 KEYRING_CREATED=false
 if [ -L "$KEYRING_FILE" ]; then