167/175 gain '### Added', 173/178 '### Changed', 180 '### Fixed' — every
bullet byte-identical, headings only (the #158 bar, inverted). CONSUMERS.md
names the sentinel and the flip procedure; changelog.d/README.md names the
sentinel. 182.md is this PR's own fragment, grouped atop the sentinel it
ships.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
