Reviewed `f3a53201`.

| Round 18 finding | Disposition | Assessment |
|---|---|---|
| P2: lifecycle property cannot exercise removal during relocation | Resolved | Replacement and release events now exercise blocked cleanup followed by a crash. Recovery distinguishes participating boxes from excluded boxes and checks that excluded boxes never reopen. |
| P2: hash-choice test does not assert the hash winner | Resolved | The test independently calculates SHA-256 winners for two hostnames choosing opposite boxes and checks both results. |

No new findings. Rulings 1–27 are accepted. Stage B contracts are complete. L21 remains open, with recovery refusing a nonempty database whose pinned manifest lacks its key.

All 12 embedded patches pass `git apply --check`; all 47 Go blocks parse with `gofmt`. Compilation, runtime tests and mutations were not independently reproduced in this read-only workspace.

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**FIRST PROMPT:**
“Follow the review brief docs/superpowers/plans/CODEX-PLAN-REGION-HA-1BN-BRIEF-19.md. Review the plan at commit f3a53201.”

**WHAT:**
Review Stage A readiness and Stage B contracts.

**STATUS:**
Both prior findings resolved; no new findings.

**NEEDED:**
Nothing for this review.

**RECOMMENDED:**
Build Stage A. Retain the Stage B integration review and joint-model merge gate.

**SESSION:**
Safe to close — no files changed or processes left running.

**Verdict: stage A ready to build, with stage B contracts complete.**