chore(stack): converge #821 onto current #819

[seonghobae]

Internal stack-convergence PR. Merge current #819 head 84a6006598b77824f048f2f41d1000b07a5ef7f7 into existing #821 branch 11a785533ba52e6b1c6854203818902e38736dc5 with a normal two-parent merge. Preserve ADR 0289/grouping-comparison product delta and repaired parent lineage; no force-push, destructive rebase, or new authority.

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