chore(stack): reconcile #268 with authoritative #270 head

[seonghobae]

Temporary stack-maintenance PR. Merge authoritative parent branch fix/pii-logging-16240128950440010639 at exact head c1239e20b048a582b19cb9eeb90f2c29f7c8f814 into child branch fix/admin-endpoint-auth-clean so #268 is no longer behind its stated parent and retains the parent’s broad pull_request: {} CI contract and regression coverage. This PR must be merged only if GitHub reports a conflict-free exact-head merge; it is not product scope and must not remain open afterward.

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[seonghobae]

Closing without merge: GitHub reports this stack-maintenance PR as non-mergeable because the parent and child modify overlapping files. An automatic branch-to-branch merge would not safely preserve the authoritative parent security and CI contracts. The child must be reconstructed or reconciled with explicit conflict resolution; no checks, reviews, or approvals from this temporary PR are transferable.