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Ping QiuandClaude Opus 4.6
1b3edd7856
Two-phase prepare/commit/cancel protocol ensures all replicas expand atomically. Standalone volumes use direct-commit (unchanged behavior). Engine: PrepareExpand/CommitExpand/CancelExpand with on-disk PreparedSize+ExpandEpoch in superblock, crash recovery clears stale prepare state on open, v.mu serializes concurrent expand operations. Proto: 3 new RPCs (PrepareExpand/CommitExpand/CancelExpandBlockVolume). Coordinator: expandClean flag pattern — ReleaseExpandInflight only on clean success or full cancel. Partial replica commit failure calls MarkExpandFailed (keeps ExpandInProgress=true, suppresses heartbeat size updates). ClearExpandFailed for manual reconciliation. Registry: AcquireExpandInflight records PendingExpandSize+ExpandEpoch. ExpandFailed state blocks new expands until cleared. Tests: 15 engine + 4 VS + 10 coordinator + heartbeat suppression regression + updated QA CP82/durability tests with prepare/commit mocks. Also includes CP11A-1 remaining: QA storage profile tests, QA io_backend config tests, testrunner perf-baseline scenarios and coordinated-expand actions. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>