Feat (Phase 3): Implement Git hook integration and pre-commit framework support

Feat (Phase 1 & 2): Extract scanner module and add CLI interface

Improve: Broaden CWE families for smoother reward signals

Add reward tuning, improved prompt, eval harness, and serving Dockerfile

Add selfcheck cache entry for Python dependencies with last check timestamp

Improve: More robust case-insensitive XML parsing for small models

Initial clean deploy commit