Rebuild: fix J1 orientation (90°), re-place all components, Freerouting orthogonal routing, 84 GND vias
- J1 rotated 90° so USB-C mating face faces left board edge - All 23 components re-placed with proper spacing (8 courtyard overlaps remain — all ESP32 keepout) - Freerouting v2.2.4: 21/25 nets autorouted cleanly - 3V3/VBUS_SENSE manually routed on B.Cu for remaining 4 nets - 84 GND stitching vias (grid + around_refs) - DRC: 158 violations (0 tracks_crossing, 2 shorts, 84 via_dangling zone-fill dependent) - Board 65x35mm, 2-layer
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