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Structural mobile rules become failing tests (M4 'test-lock what's lockable'): the flat EDGE BOARD shows <768px and game cards are desktop-only; the board renders TeamChips + tier GradeBadge + sign-colored hero edge% + the ranked opacity ramp; document never scrolls sideways at 390px. Source assertions — they lock the RULES, not the pixels (that's the master audit). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>