feat(repair): --rebuild-since cutoff for rebuild mode - #127
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Crossed summaries whose span starts at or after the cutoff (a message id, or an ISO date resolved to the first message at or after it) are dissolved for the ladder to re-fold; older ones get the compact treatment. Regions that were repaired by hand are never re-summarized. The plan reports where the cutoff landed and how the crossed set split. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
A hole owned by a root two or more levels below the crossed summary could not be adopted (adoption only knew one level down), so the summary's children were detached and, when they had no home, every ancestor unravelled — a 69-leaf hole took an L5 of 26k leaves apart. The owner is now adopted into the descendant one level above it whose span is adjacent (the crossed summary itself when the owner is one level down). Fleet dry runs: depth loss under compact drops to 0 on most stores. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Rebuild mode re-summarizes the regions it dissolves. On stores whose older eras were repaired by hand (ownership surgery, refusal quarantines resolved by fallback, restored lineages), re-folding those eras would surface the same problems again and spend summarizer calls rediscovering them.
--rebuild-since <messageId|ISO date>: only crossed summaries whose span starts at or after the cutoff are dissolved for the ladder to re-fold; older ones get the compact treatment (adoption / re-homing, no model calls). An ISO date resolves to the first message at or after it. The plan reports where the cutoff landed and how the crossed set split (rebuildSince: {id, position, rebuilt, compacted}).Tests: cutoff by id and by date, unmatched cutoff throws; downward adoption closes a deep hole with no detachment. Suite 888/888. Dry-run on eleven production store copies: every plan reaches a clean store; depth loss under compact is now 0 on eight of them.
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