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docs(p15): update G9C post-close durable ack evidence

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2026-05-02 19:54:28 -07:00
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sw-block/design/v3-phase-15-g9c-replica-ready-feed-continuity-mini-plan.md
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# V3 Phase 15 G9C — ReplicaReady Feed Continuity / Post-Close ACK Mini-Plan
**Date**: 2026-05-02
**Status**: A-slice landed (`1e36a50`)
**Status**: B-slice landed (`ca5d4f6`)
**Code branch**: `p15-g9c/replica-ready-feed-continuity`
**Predecessors**: G9B replica join lifecycle close
@@ -88,10 +88,32 @@ Both passed on `p15-g9c/replica-ready-feed-continuity`.
---
## 6. Next Slice
## 6. B-Slice Evidence
G9C-B should move from component predicate to integration signal shape:
Code: `seaweed_block@ca5d4f6` — `G9C: emit post-close durable ack from dual-lane recovery`
1. Ensure the real recovery feeder path emits a post-close durable/progress fact after the recovery window closes.
2. Add one L2 or subprocess test where a recovered replica remains `recovering` immediately after close, then becomes `ready` only after the real progress callback.
What landed:
1. Receiver `BarrierResp` now carries durable achieved LSN: `min(TryComplete achieved, Sync frontier)`.
2. Dual-lane `BlockExecutor` emits `OnDurableAck` after successful `OnSessionClose`.
3. The post-close ACK uses the receiver's durable BarrierResp witness, not the primary frontier intent.
4. `TestDualLane_BlockExecutor_StartRebuild` now pins event order: close first, post-close durable ACK second.
Verification:
```powershell
go test ./core/recovery/... ./core/transport/... ./core/engine ./core/adapter ./core/host/volume -count=1
go test ./core/authority ./core/recovery/... ./core/transport/... ./core/engine ./core/adapter ./core/host/volume -count=1
```
Both passed on `p15-g9c/replica-ready-feed-continuity`.
---
## 7. Next Slice
G9C-C should move from transport signal shape to host/daemon lifecycle evidence:
1. Add one L2 or subprocess test where a recovered replica remains `recovering` immediately after close, then becomes `ready` only after the real progress callback.
2. Prove the status endpoint reflects the same transition.
3. Keep placement and ACK voter eligibility out of this slice unless explicitly ratified.