Adds crisis detection and response system with 5-tier classification:
- crisis/PROTOCOL.md: Crisis response protocol and tier definitions
- crisis/detect.py: Tiered indicator engine (LOW/MEDIUM/HIGH/CRITICAL)
- crisis/response.py: Timmy's crisis responses and UI flag generation
- crisis/gateway.py: API gateway wrapper for crisis detection
- crisis/tests.py: Unit tests for all crisis modules
Integrates with existing crisis UI components in index.html.
All smoke tests pass.
