chore(stack): validate #57 replay on current #56

[seonghobae]

Temporary bounded validation PR for reconciling #57 after #56 advanced. Base is exact current #56 head 00d8d4405943094ac717020eaaae79c3aba88537; candidate head is 6a6fac2a99134f2bf0271d0d550dffd36ddb6d9c. The candidate replays exactly the ten #57 feature files from prior #57 head b6293ebf4c0f5957b3a5ba2de0f03c512cff7069; all pre-existing replayed blobs were verified byte-identical and the three added regression files were copied byte-identically. This PR exists only to obtain fresh exact-candidate CI/Release Acceptance evidence before moving the original #57 branch. Do not merge this validation PR. Close it after validated reconciliation or if any gate fails.

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