Add Premium Librarian MVP for codebase intelligence
Implements an RLM-powered codebase intelligence system that:
- Ingests git repositories and chunks code intelligently
- Stores chunks in eXist-db for RAG retrieval
- Answers natural language queries using LLM synthesis
New package xml_pipeline/librarian/ with:
- chunker.py: AST-based code chunking (Python, JS/TS, C++)
- ingest.py: Git clone + file walking + chunk storage
- index.py: Structural index building (files, functions, classes)
- query.py: RAG search + LLM synthesis with source citations
- primitives.py: XML payloads (LibrarianIngest, LibrarianQuery, etc.)
- handler.py: Message handlers for organism integration
Also adds GitPython and aiohttp as optional [librarian] dependencies.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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