git-base-branch.cjs is the compiled output of src/git-base-branch.cts (emitted by `npm run build:lib`), but was the only TS-generated artifact under gsd-core/bin/lib/ still tracked in git — its 117 ADR-457 build-at-publish siblings are all gitignored. The committed copy had already drifted stale (build:lib regenerates a 1-line comment diff), producing spurious worktree diffs.
Add it to the ADR-457 block in .gitignore and git rm --cached it, matching its siblings. The working-tree copy is regenerated by build:lib (pretest/prepublish); module behavior and tests/git-base-branch.test.cjs are unchanged.
Closes#1321
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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