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changelog-pr
Create or update release/changelog artifacts using Keep a Changelog. Use when the user asks to create a changelog PR, update a changelog, refresh a release PR body, summarize changes since a tag, or prepare a PR description from a branch diff. Inputs - source/target branches (or current branch → main default), repo merge style (squash or regular), and existing CHANGELOG.md / release PR if updating. Do not use when the PR is non-release (write a normal PR body), the user wants raw commit summaries (use git log), the work is cutting a new release branch (separate workflow), or the request is a one-off email/note. Produces a Keep a Changelog-formatted PR body OR updated CHANGELOG.md [Unreleased] section, with sections only for categories that have entries. Escalate if merge style cannot be detected, existing manual release notes are present and may be stale, or source/target branches are ambiguous.
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