changelog

Generate or update the changelog entry for the current branch under changelog/YYYYMMDD-HHMMSS-<slug>.md: derive its metadata from git and the diff, write the frontmatter and a grouped, categorised body, run the deterministic enrichment scripts, then validate the result.

This skill is the single source of truth for what a valid changelog entry is — the frontmatter schema, the field-ownership boundaries, idempotent update-vs-create, and the validation gate. The same contract is enforced downstream by a consumer repo's CI and by the post-merge enricher that fills the post-merge fields (@rheged-studio/changelog-core, run in-repo by reusable-changelog-enrich.yml — no longer a central release-orchestrator step), so the authoring rules live here once.

It is invoked two ways: