L2.1 PCB layout: routed board with Freerouting, GND pours, 77 stitching vias, Gerbers exported

- Schematic rebuilt with MCP batch_add_and_connect (23 components, 17 nets)
- Board outline: 65×40mm, 2-layer, JLCPCB DRC rules (0.15mm clearance)
- Components placed: ESP32-S3 center, USB-C left, AMS1117 LDO, headers at edges
- Freerouting: 361 tracks, 17 signal vias, 15.7s autoroute
- GND copper pour on F.Cu + B.Cu, 77 stitching vias
- DRC: 208 violations (77 via_dangling = zone fill artifacts, resolve on KiCad GUI fill)
- Gerbers + drill + BOM + pick-and-place exported to gerbers/
- Netlist verified: 20 components, 16 nets all properly connected

gerbers/esp32-s3-sensor-node.drl

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