docs: add premerge completion summary

logs/2025-12-04-premerge-complete.md

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+# Premerge Integration Complete
+
+## Summary
+- **Branch**: `premerge/integration-upstream`
+- **Total commits applied**: 577 (from 747 upstream commits; merge commits skipped)
+- **Files changed**: 315 files, +237,709 lines, -7,896 lines
+
+## Waves Applied
+| Wave | Category | Commits | Status |
+|------|----------|---------|--------|
+| 0 | security/postgres/storage/ci | 103 | ✅ |
+| 1 | tests/workspace/chunking/ingestion | 116 | ✅ |
+| 2 | embedding/llm_cloud/rerank | 93 | ✅ |
+| 3 | json/pdf/docx/katex | 24 | ✅ |
+| 4 | dependabot/webui/misc/docs/other | 405 | ✅ |
+
+## Post-merge Fixes
+- Synced `pyproject.toml` from upstream (conflict markers removed)
+- Synced `lightrag/llm/openai.py` from upstream (missing function)
+- Synced core modules: `lightrag.py`, `operate.py`, `constants.py`, `utils.py`, `shared_storage.py`
+
+## Verification
+- Core imports: ✅ `lightrag`, `LightRAG`, `compute_args_hash` all work
+- Some test files may need updates due to API changes
+
+## Next Steps
+1. Run full test suite: `python -m pytest tests/ -m "not integration" --ignore=tests/gpt5_nano_compatibility`
+2. Run integration tests with Postgres: `python -m pytest tests/ --run-integration`
+3. Build and test webui: `cd lightrag_webui && bun install && bun run build`
+4. Review and test multi-tenant features