docs: add integration test and merge review log

logs/2025-12-04-19-35-beastmode-merge-review.md

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+# Task Log: Integration Tests and Merge Review Complete
+
+**Date:** 2025-12-04 19:35
+**Branch:** `premerge/integration-upstream`
+**Mode:** beastmode
+
+## Actions Performed
+
+1. **Started Docker Services**
+   - `docker-compose -f docker-compose.test-db.yml up -d`
+   - PostgreSQL (port 5433) and Redis (port 6380) started healthy
+
+2. **Ran Integration Tests**
+   - Fixed postgres_retry_integration test fixture (added retry config keys)
+   - Ran 6 PostgreSQL integration tests - all passed
+   - Skipped graph_storage tests (requires 'storage' fixture - script-style tests)
+
+3. **Reviewed Branch Changes**
+   - 587 total commits (376 cherry-picks + fixes + docs)
+   - 317 files changed, ~238,841 lines added
+   - No conflict markers found in codebase
+   - All Python files compile successfully
+   - Core module imports verified
+
+4. **Created Merge Readiness Document**
+   - Full test summary (104 tests passed)
+   - Code quality verification
+   - Known issues documented
+   - Merge instructions provided
+
+## Test Results
+
+| Category | Tests | Passed | Status |
+|----------|-------|--------|--------|
+| Unit Tests | 98 | 98 | ✅ |
+| Integration | 6 | 6 | ✅ |
+| **TOTAL** | **104** | **104** | **100%** |
+
+## Commits Added This Session
+- `da7df549` docs: add merge readiness review document
+- `b1b58d1f` fix: add retry config keys to postgres integration test fixture
+
+## Decisions Made
+- Used docker-compose.test-db.yml for test database (PostgreSQL with AGE extension)
+- Skipped graph_storage.py tests (script-style, not pytest compatible)
+- Skipped E2E tests (require Ollama/OpenAI service)
+
+## Next Steps
+1. Run E2E tests with Ollama when LLM service available
+2. Merge branch to main using provided instructions
+3. Tag release after production validation
+
+## Lessons/Insights
+- Integration tests require exact config key match with implementation
+- Docker test DB uses different credentials than examples (lightrag123)
+- Some test files are designed as scripts, not pytest suites
+
+## Branch Ready for Merge
+**Status: ✅ APPROVED**
+
+See `docs/diff_hku/MERGE_READINESS.md` for full details.