RMD002 — Duplicate key in a child list

Two siblings claiming the same identity. The diff will match one of them to the wrong node, and the symptom is state appearing on the wrong row.

The real fix is usually to stop writing keys: list() derives identity from the items themselves and cannot collide.

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• All diagnostics — every code the framework can report.
• Checking your app — the faults proved from the source, before anything runs.