Act as an independent reviewer of the R5 repair proposal in this repository. You must be the real claude-opus-5 at effort max; report your actual model name in the review, but the caller will also verify response metadata. Read /Users/vonng/.codex/worktrees/77ad/silo/docs/investigations/r5/plan-v1.md completely. Baseline SHA is 9ebe81c1b3611f9cc73e676b5b741c2be62c467a. Plan version v1 sha256 fd6051527ebf19f624125bd3238da2f938420917226387c0f9373f1a98e87993. No production repair has been implemented. Read docs/investigations/r5/baseline.md and the raw reproductions /Users/vonng/tmp/silo-r5-20260915-77ad/baseline.log and /Users/vonng/tmp/silo-r5-20260915-77ad/baseline-extended.log, plus /Users/vonng/tmp/silo-r5-20260915-77ad/baseline_test.go. Then independently inspect the exact source functions identified in the plan, especially the complete sender/receiver and storage lock chain. R4 owns object-api-options.go and will supply its separate KMS timestamp fix. Do not edit any files.

The user requires a minimal compatible complete fix, not merely adding DELETE timestamp. Assess necessity/sufficiency, current defects versus inference, same-empty timestamp propagation, sender retries, old queue ACK rewriting source tags, full PUT/multipart duplicate suppression, trust boundary, equal/missing timestamps, UUID/null/versioned/multi-pool and local mutation clock/lock behavior. Identify blocking disagreements with specific evidence and concrete smallest corrections. Explicitly say APPROVE or REQUEST_CHANGES for this exact v1 hash and list accepted/nonblocking/required changes. Do not claim consensus if any blocking issue remains. Be exact about limitations and whether proposed test coverage can establish the scope. Use the permitted Read/Grep/Glob tools for source verification. Return a substantive review, not just a summary.