- Pass 1 no longer materialises every classified record (full
`messages.content` included) until pass 2; `LayoutEvidence` keeps only the
capped per-position value sets (+ sessions rows for the one cross-column
invariant) and pass 2 re-streams the lost_and_found tables. A 276 MB
corrupted store no longer has to fit in memory.
- `_sentinel_holds` / `_text_shape_holds` if-ladders become rule tables.
- Tests trimmed to the three that bind behaviour (upgraded store maps by
name; verifier refuses when rows matched no layout; replayed history ends
at the current schema — the drift guard). No behaviour change; reverting
inference to "no layout" still fails the name-mapping test.
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