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/plots/README.md

@@ -0,0 +1,89 @@
+# /kicad/plots
+
+PDF plots and prints of schematics and PCB layouts.
+
+## Purpose
+This directory contains PDF plots generated from KiCad for:
+- Design documentation
+- Design reviews and approvals
+- Printing for manual assembly
+- Sharing with non-KiCad users
+- Archive documentation
+
+## File Types
+- **`.pdf`**: PDF plots of schematics and PCB layers
+- **`.svg`**: Vector graphics (optional alternative format)
+- **`.ps`**: PostScript files (legacy format)
+
+## Generating Plots in KiCad
+
+### Schematic Plots
+1. Open your schematic (`.kicad_sch`)
+2. Go to **File → Plot**
+3. Select output directory: `kicad/plots/`
+4. Choose format (PDF recommended)
+5. Configure options and click **Plot**
+
+### PCB Plots
+1. Open your PCB (`.kicad_pcb`)
+2. Go to **File → Plot**
+3. Select output directory: `kicad/plots/`
+4. Choose layers to plot
+5. Select format (PDF recommended)
+6. Click **Plot**
+
+## Recommended Plot Files
+```
+plots/
+├── schematic/
+│   ├── ProjectName-Schematic.pdf      # Complete schematic
+│   ├── ProjectName-PowerSupply.pdf    # Power supply sheet
+│   └── ProjectName-MCU.pdf            # MCU sheet
+├── pcb/
+│   ├── ProjectName-Assembly-Top.pdf   # Top assembly drawing
+│   ├── ProjectName-Assembly-Bottom.pdf # Bottom assembly drawing
+│   ├── ProjectName-Copper-F.pdf       # Front copper layer
+│   ├── ProjectName-Copper-B.pdf       # Back copper layer
+│   ├── ProjectName-Silkscreen-F.pdf   # Front silkscreen
+│   └── ProjectName-Silkscreen-B.pdf   # Back silkscreen
+└── combined/
+    ├── ProjectName-Complete.pdf       # All sheets in one file
+    └── ProjectName-Assembly.pdf       # Assembly drawings only
+```
+
+## Plot Settings Recommendations
+
+### Schematic Plots
+- **Format**: PDF
+- **Page Size**: A4 or Letter
+- **Plot Mode**: Color or Black and White
+- **Plot Frame**: Include for documentation
+- **Plot All Pages**: For multi-sheet designs
+
+### PCB Plots
+- **Format**: PDF
+- **Layers**: Select relevant layers
+- **Plot Mode**: Color recommended
+- **Drill Marks**: Include for assembly
+- **Plot Frame**: Include reference information
+- **Scale**: 1:1 for assembly drawings
+
+## Usage Guidelines
+- Generate plots at major design milestones
+- Include version information in plot titles
+- Use consistent naming conventions
+- Create combined PDFs for easy sharing
+- Include assembly drawings for manufacturing
+
+## Print Settings for Assembly
+- **Scale**: 1:1 (actual size)
+- **Paper**: A4 or larger
+- **Quality**: High resolution
+- **Color**: Recommended for clarity
+- **Margins**: Minimal for maximum size
+
+## Version Control
+- Commit plots with design changes
+- Tag releases with complete plot sets
+- Use descriptive commit messages
+- Consider file sizes for frequent commits