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-B_Mask.gbs

@@ -0,0 +1,49 @@
+%TF.GenerationSoftware,KiCad,Pcbnew,10.0.2*%
+%TF.CreationDate,2026-06-22T21:18:28+03:00*%
+%TF.ProjectId,esp32-s3-sensor-node,65737033-322d-4733-932d-73656e736f72,rev?*%
+%TF.SameCoordinates,Original*%
+%TF.FileFunction,Soldermask,Bot*%
+%TF.FilePolarity,Negative*%
+%FSLAX46Y46*%
+G04 Gerber Fmt 4.6, Leading zero omitted, Abs format (unit mm)*
+G04 Created by KiCad (PCBNEW 10.0.2) date 2026-06-22 21:18:28*
+%MOMM*%
+%LPD*%
+G01*
+G04 APERTURE LIST*
+%ADD10C,0.650000*%
+%ADD11O,1.000000X2.100000*%
+%ADD12O,1.000000X1.600000*%
+%ADD13R,1.700000X1.700000*%
+%ADD14C,1.700000*%
+G04 APERTURE END LIST*
+D10*
+%TO.C,J1*%
+X4110000Y-17400000D03*
+X9890000Y-17400000D03*
+D11*
+X2680000Y-16870000D03*
+D12*
+X2680000Y-21050000D03*
+D11*
+X11320000Y-16870000D03*
+D12*
+X11320000Y-21050000D03*
+%TD*%
+D13*
+%TO.C,J3*%
+X25000000Y-3000000D03*
+D14*
+X25000000Y-5540000D03*
+X25000000Y-8080000D03*
+X25000000Y-10620000D03*
+%TD*%
+D13*
+%TO.C,J2*%
+X58000000Y-20000000D03*
+D14*
+X58000000Y-22540000D03*
+X58000000Y-25080000D03*
+X58000000Y-27620000D03*
+%TD*%
+M02*