- Add response_model to all 8 route endpoints for runtime validation and
correct Swagger docs
- Remove global KeyError handler (routes catch it explicitly)
- Add catch-all Exception handler with logging for 500 responses
- Remove dead code in service.py get_case_graph (unused bucket variable)
- Explicit graph_backend validation in cmd_serve (memory|neo4j, else exit)
- Sanitise comma-separated query params (strip whitespace, filter empty)
- Move HTTPException to top-level import in routes.py
- Remove unused imports (Depends in dependencies.py, all_persona_names)
- Fix deprecated asyncio.get_event_loop() in test fixture
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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