fix(core-ai): fix steward agent result access and increase timeout

- Fixed: Change `result.data` to `result.output` (correct PydanticAI API)
- Increased analysis_timeout from 3s to 10s (mistral-nemo needs more time)

**Status:** Steward now initializes correctly but there's a remaining issue
with the async generator merging logic in two_stage_agent.py causing
requests to hang. This needs further investigation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

stacks/core-ai.yml

@@ -7,6 +7,8 @@ services:
     restart: unless-stopped
     ports:
       - "8086:8086" # Expose the Core AI service port
+    volumes:
+      - ../services/core-ai:/app  # Mount code directory for development
     environment:
       - HOST=0.0.0.0
       - PORT=8086