chore(stack): converge #866 onto repaired #865 head

[seonghobae]

Non-force descendant convergence after #865 advanced to 4b9f9e9b44615400e671211511ed3296d407a2ee.

Carry repaired parent lineage into feat/leftover-map-axis-singular-only-v2820 while preserving #866's one-file singular-only report-badge RED. No force-push, rebase, gate change, or historical source replay.

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