docs(ultraplan-local): v2.3.0 — skill-factory Fase 1
Doc sync for /ultra-skill-author-local release:
- CHANGELOG.md: 2.3.0 section above 2.2.0 with full feature narrative,
pipeline diagram, non-goals, new files list, new stats file
- README.md: command table row + new ## /ultra-skill-author-local section
describing pipeline, modes, IP-hygiene utility, non-goals
- CLAUDE.md: row in Commands table (committed in Step 1)
- ../../README.md: bumped ultraplan-local row v2.2.0 → v2.3.0,
expanded division-of-labor with sixth bullet for /ultra-skill-author-local,
added v2.3 narrative paragraph
Plan: .claude/projects/2026-04-18-skill-factory-fase-1-mvp/plan.md (step 12)