chore(stack): converge #822 onto current #821

[seonghobae]

Internal stack-convergence PR. Merge current #821 head 5d9ed038a8525736ba47d5a80e4ff04edfbab28c into existing #822 branch 6726353a13798c0d1566821de9885f1783ebe35f with a normal two-parent merge. Preserve ADR 0290/product delta and repaired parent lineage; no force-push, destructive rebase, or new authority.

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