- Expand README with specs, file structure, BOM overview, tools list, and help-wanted checklist
- Add ASSEMBLY.md with wiring reference table for all PCB connectors and safety notes
- Add PRINT_SETTINGS.md with per-category settings, part quantities, and Bambu compatibility note
- Add BOM.csv consolidating all three separate BOMs with manufacturer part numbers
- Add CONTRIBUTING.md with priority list of needed files (STEP, schematic, wiring diagram)
- Improve .gitignore to cover Windows, macOS, slicer output, and editor temp files
- Fix typo: Hardware_Fastners → Hardware_Fasteners
DevilDogXXX