7 cases: two covered short-circuits, timeout with committed_lsn unmoved, covering-ACK release, sync_timeout_ms fallback (bounded both directions), n_peers=1 standalone, NOT_READY passthrough via cap saturation. Watermark resolved to current_lsn - 1 (design's literal phrasing unsatisfiable per persist.h:71 invariant) with off-by-one killing power both ways. 15 tests / 7 RED; suite baseline zero. |
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