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/gerbers/README.md

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+# /kicad/gerbers
+
+Generated Gerber files for design review and verification.
+
+## Purpose
+This directory contains Gerber files generated during the design process for:
+- Design review and verification
+- Quick prototyping
+- Sharing with colleagues for feedback
+- Design iteration tracking
+
+**Note**: Final production Gerbers should be placed in `/manufacturing/gerbers/`
+
+## File Types
+- **`.gbr`**: Gerber files for copper layers
+- **`.gbrjob`**: Gerber job file (KiCad 6+)
+- **`.drl`**: Excellon drill files
+- **`.pdf`**: PDF plots for review
+
+## Generating Gerbers in KiCad
+1. Open your PCB file (`.kicad_pcb`)
+2. Go to **File → Fabrication Outputs → Gerbers**
+3. Select output directory: `kicad/gerbers/`
+4. Configure layers and options
+5. Click **Plot**
+6. Generate drill files: **File → Fabrication Outputs → Drill Files**
+
+## Typical Layer Files
+```
+gerbers/
+├── ProjectName-F_Cu.gbr        # Front copper
+├── ProjectName-B_Cu.gbr        # Back copper
+├── ProjectName-F_SilkS.gbr     # Front silkscreen
+├── ProjectName-B_SilkS.gbr     # Back silkscreen
+├── ProjectName-F_Mask.gbr      # Front solder mask
+├── ProjectName-B_Mask.gbr      # Back solder mask
+├── ProjectName-F_Paste.gbr     # Front solder paste
+├── ProjectName-B_Paste.gbr     # Back solder paste
+├── ProjectName-Edge_Cuts.gbr   # Board outline
+├── ProjectName.drl             # Drill file
+├── ProjectName-NPTH.drl        # Non-plated holes
+└── ProjectName-job.gbrjob      # Job file
+```
+
+## Review Checklist
+- [ ] All layers present and correct
+- [ ] Board outline properly defined
+- [ ] Drill files include all holes
+- [ ] Silkscreen readable and not overlapping pads
+- [ ] Solder mask openings correct
+- [ ] Component references visible
+- [ ] No missing copper or shorts
+
+## Gerber Viewers
+- **KiCad Gerber Viewer**: Built into KiCad
+- **gerbv**: Open source Gerber viewer
+- **Online viewers**: PCBWay, JLCPCB gerber viewers
+- **Manufacturer tools**: Most PCB fabs provide online viewers
+
+## Version Control
+- Include gerbers in git for design history
+- Tag important milestones
+- Use descriptive commit messages
+- Consider file size when committing frequently