docs: update SESSION_CONTEXT.md with completed test fixes

- All 223/223 backend tests now passing (100%)
- Code coverage improved to 71% (from ~43%)
- Updated progress to ~95% (from ~90%)
- Removed 'improved test coverage' from What's Missing
- Added test isolation achievement to Phase 3 status

docs/SESSION_CONTEXT.md

@@ -21,8 +21,8 @@
 - Phase 2 (Matches & Ratings API) - ✅ COMPLETED
 - Phase 1.6 (Competition Heats) - ✅ COMPLETED
 - Phase 1.5 (Email & WSDC & Profiles & Security & QR Check-in) - ✅ COMPLETED
-**Progress:** ~90% overall
-**Next Goal:** Production deployment, monitoring, improved test coverage
+**Progress:** ~95% overall
+**Next Goal:** Production deployment, monitoring
 
 ### What Works Now
 - ✅ Docker Compose (nginx:8080 + frontend + backend + PostgreSQL)
@@ -54,7 +54,6 @@
 ### What's Missing
 - ⏳ Production deployment & monitoring
 - ⏳ Competition heats UI integration improvements
-- ⏳ Improved test coverage (currently ~43% backend)
 
 ---
 
@@ -77,7 +76,7 @@
 - Socket.IO 4.8.1 for WebSocket (real-time chat)
 - PostgreSQL 15 with Prisma ORM 5.8.0
 - bcrypt + JWT authentication
-- Jest + supertest for testing (81%+ coverage)
+- Jest + supertest for testing (223/223 tests passing, 71% coverage)
 
 **WebRTC:**
 - RTCPeerConnection
@@ -471,5 +470,6 @@ RUN apk add --no-cache openssl
   - ✅ WebRTC test suite (7 backend tests passing)
   - ✅ Security hardening (CSRF, Account Lockout, env variables, comprehensive tests)
   - ✅ PWA features (manifest, service worker, icons, iOS support, install prompts)
+  - ✅ Test isolation & fixes (223/223 tests passing, 71% coverage)
   - ⏳ Production deployment
-**Next Goal:** Production deployment, monitoring, improved test coverage
+**Next Goal:** Production deployment, monitoring