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GitHub can delete the local source branch during PR merge while the Guardex cleanup phase is still about to run its own branch delete step. That race was failing finish even though the branch was already gone and the remaining cleanup work could succeed. This change makes the local cleanup step re-check branch existence before and after `git branch -d`, treat an already-missing ref as informational, mirror the behavior into the template script, and lock the path with a focused finish regression plus metadata parity coverage. Constraint: Finish cleanup must still fail on real local branch deletion errors Rejected: Ignore all `git branch -d` failures | would hide genuine cleanup problems Confidence: high Scope-risk: narrow Reversibility: clean Directive: Keep the branch-exists recheck paired with the concrete already-missing log line in both runtime and template scripts Tested: node --test test/finish.test.js Tested: node --check bin/multiagent-safety.js Tested: node --test test/metadata.test.js Tested: openspec validate agent-codex-tolerate-already-deleted-local-branch-in-2026-04-22-20-43 --type change --strict Tested: openspec validate --specs Not-tested: live GitHub PR merge against the real repository before finish flow
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Automated by gx branch finish (PR flow).