test(ui): deepen keyed reconciliation (complex moves)#48
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Toward React equivalency for the reconciler's hardest move patterns: full reverse (order flips, every node moved not recreated — identity preserved), simultaneous insert+remove, collapse to one survivor, and grow back. Each produces the correct order and child count. Verified via the native reconciler harness (the same surface that found the v3.4.8 duplicate-key leak). All pass; no version bump. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Deepens keyed reconciliation: full reverse (identity preserved), simultaneous insert+remove, collapse, grow. All pass; no version bump.
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