- Add app/api/routes/agents.py with 11 endpoints:
GET/POST/PUT/DELETE /agents/local (local directory agent configs)
GET/POST/PUT/DELETE /agents/cloud (cloud connector agent configs)
GET /agents/catalog (hardcoded agent type catalog)
GET /agents/runs (paginated run logs with agent_id/page/limit filters)
POST /agents/{id}/run (manual trigger stub, dispatch wired in step 3.4)
- Tier-gate creation via combined local+cloud batch_active limit
- Ownership checks on all mutations (404 on mismatch)
- Cascade delete of run logs via SQLAlchemy relationship
- Register agents router in app/main.py
- Fix missing import json in app/agents/task_agent.py
