Fix review lifecycle convergence

[yvette-carlisle]

Summary

• stop review findings churn from writing checkpoints after the convergence budget is exhausted
• avoid false validation failures for no_effective_diff retryable outcomes and add state-machine gap evidence
• make post-review ready/wait lanes stop projecting repair review checkpoints
• preserve adopt/rebind private evidence and stable evidence readback commands

Verification

• cargo make check
• git diff --check