feat: proper isogrid pocket generation with boundary clipping + v2.0 outer boundary
- Equilateral triangle grid pattern - Shapely polygon clipping to actual boundary shape - v2.0 typed segments (arcs) for outer boundary - 4mm fillets, 3mm ribs, 2mm frame offset - Sandbox 1: 25 pockets (80mm), Sandbox 2: 8 pockets (50mm)
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