Fix schematic syntax & finalize ERC
- Fixed: double-empty-string bug () in power symbol Footprint properties - Fixed: single-line 67KB file was unparseable by KiCad - properly pretty-printed to 4408 lines - Added: 42 no-connect flags for unused pins (J1 SBU, ESP32 GPIOs, NC resistors) - Added: PWR_FLAG and GND power symbols connected to nets - Added: batch_connect wiring for passives (C1-C5, R1-R7) - Snap-to-grid: 152 elements aligned to 1.27mm grid - Board sync: 13 footprints added, 16 nets confirmed - Custom CH224K symbol verified and committed
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