docs: Add 5 vector database integration guides (HAYSTACK, WEAVIATE, CHROMA, FAISS, QDRANT)
- Add HAYSTACK.md (700+ lines): Enterprise RAG framework with BM25 + hybrid search
- Add WEAVIATE.md (867 lines): Multi-tenancy, GraphQL, hybrid search, generative search
- Add CHROMA.md (832 lines): Local-first with free embeddings, persistent storage
- Add FAISS.md (785 lines): Billion-scale with GPU acceleration and product quantization
- Add QDRANT.md (746 lines): High-performance Rust engine with rich filtering
All guides follow proven 11-section pattern:
- Problem/Solution/Quick Start/Setup/Advanced/Best Practices
- Real-world examples (100-200 lines working code)
- Troubleshooting sections
- Before/After comparisons
Total: ~3,930 lines of comprehensive integration documentation
Test results:
- 26/26 tests passing for new features (RAG chunker + Haystack adaptor)
- 108 total tests passing (100%)
- 0 failures
This completes all optional integration guides from ACTION_PLAN.md.
Universal preprocessor positioning now covers:
- RAG Frameworks: LangChain, LlamaIndex, Haystack (3/3)
- Vector Databases: Pinecone, Weaviate, Chroma, FAISS, Qdrant (5/5)
- AI Coding Tools: Cursor, Windsurf, Cline, Continue.dev (4/4)
- Chat Platforms: Claude, Gemini, ChatGPT (3/3)
Total: 15 integration guides across 4 categories (+50% coverage)
Ready for v2.10.0 release.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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