Claude Code: Fix import path resolution in error_handlers.py for Docker runtime

Fix import error for agents.brain_minimal by explicitly adding
/app/openclaw/.openclaw to sys.path before importing agents module.
This ensures the brain module can be found in Docker WORKDIR /app.

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

error_handlers.py

@@ -150,6 +150,12 @@ def handle_brain_response(message: str) -> str:
     try:
         # Import openclaw first to set up sys.path, then import agents
         import openclaw
+        # Ensure .openclaw path is added for agents import
+        import sys
+        from pathlib import Path
+        _openclaw_internal = Path(__file__).parent / "openclaw" / ".openclaw"
+        if str(_openclaw_internal) not in sys.path:
+            sys.path.insert(0, str(_openclaw_internal))
         from agents import brain_minimal
 
         brain = brain_minimal.get_brain(agent_name="cain", legacy_mode=True)