Move plugin sources into plugins/ subdirectory, add 64x64 package
icon in resources/, and add metadata.json for PCM compatibility.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Validates STM32 MCU pin assignments between KiCad PCB/schematic
and STM32CubeMX .ioc files with colour-coded results.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>