Refines 34ffcda86. The export --stage approach preserved the mutation but did more
than the bug needs: it eagerly stages changelog rows mid-checkout (surprising in
git status), and those staged rows can leak onto the wrong branch when a later
switch rebuilds by replaying the working-tree changelog.
Minimal fix: on a branch *creation* / no-op checkout (prev-HEAD == new-HEAD) the
working tree is unchanged, so pql.db already holds the committed state plus any
uncommitted mutation — just skip the whole block (do nothing). The mutation stays
in pql.db untouched and the next commit's pre-commit hook flushes it normally. Only
a real branch *switch* (prev != new) rebuilds. No git-index side effects, no leak.
Verified: same-HEAD invocation preserves an uncommitted status mutation and stages
nothing. (Credit: pql-clide's review of the upstream feature request.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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