fix(pcm): unify KiCad 6–10.99 installation and add update metadata
- Build kicad_CoilForge_plugin-v0.2.8-PCM.zip for all supported versions
- Preserve existing ActionPlugin and IPC/Tk interfaces and algorithms
- Select PCM entrypoints without duplicate plugin registration
- Report missing Tk dependencies and handle KiCad 9/10 settings API errors
- Generate repository indexes with release history and integrity checks
- Add regression tests and document native compatibility verification