chore(stack): converge #863 onto repaired #862 head

[seonghobae]

Non-force descendant convergence after #862 advanced to 0ce9685ef4e46e2ab4c8f22671eb053efb414550.

Carry repaired parent lineage into feat/leftover-map-compare-axis-singular-v2800 while preserving #863's one-file comparison-axis singular-value RED. No force-push, rebase, gate change, or historical source replay.

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