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/libraries/README.md

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+# /kicad/libraries
+
+Custom KiCad libraries for your project.
+
+## Directory Structure
+
+- `symbols/` - Custom schematic symbols (`.kicad_sym` files)
+- `footprints/` - Custom footprints (`.pretty` directories)
+- `3dmodels/` - Custom 3D models (`.step`, `.wrl` files)
+
+## Usage Guidelines
+
+### Symbols (`symbols/`)
+- Store custom schematic symbols as `.kicad_sym` files
+- Use descriptive names (e.g., `MyProject_MCU.kicad_sym`)
+- Include symbol properties and documentation
+
+### Footprints (`footprints/`)
+- Each footprint library is a `.pretty` directory
+- Store related footprints together (e.g., `MyProject_Connectors.pretty/`)
+- Include courtyard and fabrication layers
+
+### 3D Models (`3dmodels/`)
+- Store STEP files (`.step`) for mechanical accuracy
+- Store VRML files (`.wrl`) for KiCad 3D viewer compatibility
+- Use consistent naming with footprints
+
+## Library Configuration
+
+1. In KiCad, go to **Preferences → Manage Symbol Libraries**
+2. Add your custom symbol libraries from `symbols/`
+3. Go to **Preferences → Manage Footprint Libraries**
+4. Add your custom footprint libraries from `footprints/`
+5. Configure 3D model paths to point to `3dmodels/`
+
+## Best Practices
+
+- Use relative paths in your project settings
+- Document custom components in `/hardware/datasheets/`
+- Version control all custom libraries
+- Follow KiCad naming conventions