gitCommit() was adding the JSONL file but then committing ALL staged
changes (no pathspec). If other files were staged (e.g., deletions from
git add -A), they would be swept into the bd sync commit.
Fixed by adding pathspec to both gitCommit() and commitToExternalBeadsRepo()
so they only commit what they explicitly staged.
This was the root cause of PR #722 files being deleted - they were staged
for deletion in the working tree and got committed by bd sync.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2f9d423ac8