fix(reviewer-bot): harden stage2 readiness closure gates#554

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PLeVasseur:refactor/reviewer-bot-maintainability-remediation-stage1-corrective-stage2-readiness-followupPLeVasseur/safety-critical-rust-coding-guidelines:refactor/reviewer-bot-maintainability-remediation-stage1-corrective-stage2-readiness-followupCopy head branch name to clipboard