bin/changelog-assemble 0.2.0 — the section and the fragment deletions in
one commit, per #118. changelog.d/ keeps its README.md marker and stays
armed by existing.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The flip's mechanical half (#117): the 26 entries under '## Unreleased'
move verbatim to changelog.d/<issue>.md, the heading is deleted, the
directory gains its marker README (#112 D1) and this PR's own fragment
(112.md), CHANGELOG.md's preamble describes fragments, and labeler.yml
maps changelog.d/** into scope:release-flow.