Update CLAUDE.md, MkDocs, nginx docs proxy, .claude/rules
- CLAUDE.md: Comprehensive documentation for core infrastructure
- docs-src: Cleaned 316MB junk, kept only markdown docs
- mkdocs.yml: Updated nav for core-only content
- nginx: Docs proxy targets split (3002->lehrer, 3007->compliance)
- docker-compose: Fixed docs port mapping (8009:80), added INSTALL_LOCK
- .claude/rules: testing, documentation, open-source-policy, night-scheduler
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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