chore(stack): validate PR #59 on current #58 base

[seonghobae]

Bounded validation path for PR #59 reconciliation. Candidate 76b4abe68e8f2ff3deb8a05423d340dd32fef09e is exactly one commit ahead / zero behind exact current #58 head c0b26eb8746820b13f7ef0f4d191827a8f7e2a94 and replays exactly the 11 resumable-checkpoint feature files from predecessor #59 head cc1595774ee6ab076f72dc6ba5a4175d3bec0f5d. The overlapping #58 paths are byte-identical to the predecessor #59 base by construction of the validated #58 replay. No merge, approval, release, or temporary write-capable workflow is authorized. Close unmerged after exact-head CI and Release Acceptance.

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[seonghobae]

Validation complete. Candidate 76b4abe68e8f2ff3deb8a05423d340dd32fef09e was exactly one commit ahead / zero behind exact #58 base c0b26eb8746820b13f7ef0f4d191827a8f7e2a94, changed exactly the 11 intended #59 resumable-checkpoint files, and passed CI 31284620773 plus Release Acceptance 31284620774. The authoritative #59 branch has now been reconciled to this validated commit, so this temporary validation PR is superseded and is being closed unmerged.