fix: bug: TOML-driven agent services lack FACTORY_REPO env and projects/env/state volume mounts — sidecar silently never polls (#855)

In _generate_local_model_services:
- Add FACTORY_REPO environment variable to enable factory bootstrap
- Add volume mounts for ./projects, ./.env, and ./state to provide real project TOMLs

In entrypoint.sh:
- Add validate_projects_dir() function that fails loudly if no real .toml files
  are found in the projects directory (prevents silent-zombie mode where the
  polling loop matches zero files and does nothing forever)

This fixes the issue where hired agents (via hire-an-agent) ran forever without
picking up any work because they were pinned to the baked /home/agent/disinto
directory with only *.toml.example files.

docker/agents/entrypoint.sh

@@ -342,9 +342,28 @@ bootstrap_ops_repos
 # Bootstrap factory repo — switch DISINTO_DIR to live checkout (#593)
 bootstrap_factory_repo
 
+# Validate that projects directory has at least one real .toml file (not .example)
+# This prevents the silent-zombie mode where the polling loop matches zero files
+# and does nothing forever.
+validate_projects_dir() {
+  local toml_count
+  toml_count=$(compgen -G "${DISINTO_DIR}/projects/*.toml" 2>/dev/null | wc -l)
+  if [ "$toml_count" -eq 0 ]; then
+    log "FATAL: No real .toml files found in ${DISINTO_DIR}/projects/"
+    log "Expected at least one project config file (e.g., disinto.toml)"
+    log "The directory only contains *.toml.example template files."
+    log "Mount the host ./projects volume or copy real .toml files into the container."
+    exit 1
+  fi
+  log "Projects directory validated: ${toml_count} real .toml file(s) found"
+}
+
 # Initialize state directory for check_active guards
 init_state_dir
 
+# Validate projects directory before entering polling loop
+validate_projects_dir
+
 # Parse AGENT_ROLES env var (default: all agents)
 # Expected format: comma-separated list like "review,dev,gardener"
 AGENT_ROLES="${AGENT_ROLES:-review,dev,gardener,architect,planner,predictor,supervisor}"