codex: add exact release pin recovery - #26
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The v2-to-v3 bootstrap pinned tb/codex/release at ba107 even though PR #22 had already advanced the source to 40589. That leaves generated release workflows without the source-ref metadata fix. Add a checked-in one-shot manifest and a narrow recover-release-pin command. It accepts only the reviewed ca1/ba107/40589/PR22 tuple, validates through the canonical plan transition gate, atomically creates the missing immutable pin and updates meta, then deletes its own manifest. The public path cannot override the manifest binding. Test-only fixture entrypoints cover disposable mechanics without weakening the production command.
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The v2-to-v3 bootstrap pinned tb/codex/release at ba107 even though merged PR #22 advanced the source to 40589. This adds an incident-specific, self-disabling recovery path: the checked-in manifest binds the exact ca1/ba107/40589/PR22 tuple, the command validates it through the canonical plan-transition gate, atomically creates only the missing immutable pin plus the codex.plan transition, and deletes the manifest. Public recovery has no SHA override; disposable test mechanics use gated test-only entrypoints.
Tests: sh -n .github/workflows/codex-branch.sh; sh -n t/t9905-codex-branch.sh; git diff --check; t/t9905-codex-branch.sh -v -i --root=/private/tmp/t9905-release-recovery-full-20260806-7 (117/117).