chore(stack): validate PR #60 on current #59 base

[seonghobae]

Bounded validation path for PR #60 reconciliation. Candidate 6b2e19e3503ef3671aa2d2f974df7561ba1e1ca0 is exactly one commit ahead / zero behind exact current #59 head 76b4abe68e8f2ff3deb8a05423d340dd32fef09e and replays exactly the 20 durable-checkpoint-store feature files from predecessor #60 head efe2c81f8a9cd8301461fe8ae3ce9d5901652185. The six overlapping #59 paths use exact predecessor-base blobs, and no #60-specific Docker, migration, store, or test path was present in the #59 reconciliation slice.

Validation completed successfully: CI 31284818565 and Release Acceptance 31284818567 both passed on the exact candidate. The authoritative agent/persistent-result-checkpoint-store branch was then reconciled to this exact validated commit after a fresh writer-lease check. This temporary PR is therefore superseded and closed unmerged. No merge, approval, release, or temporary write-capable workflow was used.

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