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Matysh
65070c0520
Mechanism A (wall drag along its normal, shared stretches of neighbours move together, T-junctions insert vertices) and mechanism B (corner scale frame) with every stop: min room size ~30 cm, self-intersection, foreign rooms (polyclip area check — roomsOverlap alone misses collinear slide-over), islands, opening anchors. node:test units pin each stop numerically.