Tags: angellaudde/notaire-be

Restructure to standard skill layout + v1.0.0 audit

- references/ subdirectory restored; SKILL.md routes to references/<name>.md
  (matches the notaire-be/SKILL.md + notaire-be/references/* package convention)
- README rewritten to house style; CHANGELOG.md + docs/audit-2026-05.md added
- .gitignore ignores build artifacts (*.zip, *.skill, _publish/)