Claude Code: add Cain startup ready log and stderr redirect

- Add "Cain is ready" print to startup event handler for clear startup signal
- Redirect stderr to stdout in entrypoint.sh uvicorn command (2>&1)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -81,6 +81,7 @@ async def startup_event():
         logger.warning(f">>> STARTUP: brain_minimal import failed: {e}")
 
     logger.info(">>> STARTUP: Initialization complete, ready to serve requests")
+    print("Cain is ready")
 
 
 @app.get("/")

entrypoint.sh

@@ -38,7 +38,7 @@ echo "=========================================="
 # Auto-restart loop: if uvicorn crashes, wait 2s and restart
 while true; do
     echo "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] Starting uvicorn on 0.0.0.0:${PORT:-7860}..."
-    uvicorn app:app --host 0.0.0.0 --port "${PORT:-7860}"
+    uvicorn app:app --host 0.0.0.0 --port "${PORT:-7860}" 2>&1
     EXIT_CODE=$?
 
     echo "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] uvicorn exited with code: $EXIT_CODE"