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.github/instructions/state-and-dnd.md

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+# State and DnD Instructions
+
+## Scope
+- Applies to stateful feature logic and drag/drop interactions (e.g., Kanban with dnd-kit).
+
+## Rules
+- Keep business/data mutations in hooks; keep components mostly presentational.
+- Persist ordering changes deterministically using explicit `position` updates.
+- Avoid nested competing scroll containers when horizontal drag/drop is involved.
+- Ensure drag overlays and scroll behavior work for mouse and touch sensors.
+- When replacing local persistence with API-backed state, remove stale store dependencies cleanly.
+
+## Reliability
+- Debounce or batch expensive reorder API calls where appropriate.
+- After structural changes (move/delete section), refresh canonical state from API when needed.