Refine repository structure for KiCad 9 optimization

- Add dedicated /kicad/ directory with organized subdirectories for libraries, schematics, gerbers, plots, and backups
- Create comprehensive KiCad 9 library structure (symbols, footprints, 3D models)
- Add manufacturing-ready directories for production files (gerbers, drill, pick-and-place)
- Update all README files with KiCad-specific documentation and workflows
- Add KiCad-optimized .gitignore file for proper version control
- Create KICAD-PROJECT-TEMPLATE.md comprehensive usage guide
- Add hardware assembly documentation and BOM management
- Include detailed manufacturing file generation instructions
- Add docs structure with design-notes and user-manual directories
- Provide complete workflow from design to manufacturing with quality checklists

kicad/README.md

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+# /kicad
+
+KiCad-specific files and directories for your KiCad 9 project.
+
+## Directory Structure
+
+- `libraries/` - Custom KiCad libraries (symbols, footprints, 3D models)
+- `schematics/` - Additional/hierarchical schematic files
+- `gerbers/` - Generated Gerber files for review
+- `plots/` - PDF plots and prints of schematics/PCBs
+- `backups/` - KiCad automatic backups (excluded from git)
+
+## Usage Notes
+
+- Your main project files (`.kicad_pro`, `.kicad_sch`, `.kicad_pcb`) should be in the root directory
+- Use relative paths when referencing custom libraries
+- The `backups/` folder is automatically managed by KiCad and excluded from version control
+- Generated files in `gerbers/` and `plots/` are for review - final production files go in `/manufacturing/`