doctor: dedupe mirror tests into a table, trim comments
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Collapse the seven checkCommittedMetadataMirror tests into one table-driven test (setup returns the expected final mirror state) and cut comment prose throughout the mirror check, diagnosis, and bundle report to the essentials.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: 2e1b1751fbc2
Checkpoints
Checkpoint 1
Checkpoint 1