- Renumber diagnostics to follow consistent EOE0XX scheme
- Add ApiVersioningValidator for version-related checks (EOE027-031)
- Add NamingValidator for naming conventions (EOE033)
- Add DiagnosticsDemos sample project showing all diagnostics
- Update CLAUDE.md documentation across all projects
- Update test snapshots for new diagnostic IDs

Breaking: Diagnostic IDs have been renumbered for consistency

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>