P2-005: Agent status endpoints
- GET /api/agents/status — list all user's agents with status
- GET /api/agents/:id/status — single agent status
P2-006: Agent chat routing
- Add optional `agent` parameter to chat requests
- Validate agent exists and is active for user
- Pass agent personality/model config to OpenClaw
Task: MS22-P2-005, MS22-P2-006
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>