fix: add missing AI/LangChain root-nodes documentation path
- Added cluster-nodes/root-nodes path to DocsMapper
- Fixed documentation mapping for 16 critical AI/LangChain nodes
- AI Agent now has documentation (was missing)
- LangChain documentation coverage: 61.1% → 75.6% (+14.5%)
- Overall documentation coverage: 87% → 89.5% (+2.5%)
Affected nodes now with documentation:
- AI Agent, Basic LLM Chain, Q&A Chain
- Sentiment Analysis, Summarization Chain
- All vector store nodes (Milvus, MongoDB, PGVector, etc.)
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
b6e4642847