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

manufacturing/gerbers/README.md

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+# /manufacturing/gerbers
+
+Final production Gerber files for PCB fabrication.
+
+## Purpose
+This directory contains the final, production-ready Gerber files that will be sent to your PCB manufacturer. These files define all the copper layers, solder mask, silkscreen, and board outline.
+
+## File Types
+- **`.gbr`**: Gerber files for each PCB layer
+- **`.gbrjob`**: Gerber job file (KiCad 6+) with layer stack information
+- **`.zip`**: Packaged files ready for manufacturer submission
+
+## Standard Gerber Files
+```
+gerbers/
+├── ProjectName-F_Cu.gbr        # Front copper layer
+├── ProjectName-B_Cu.gbr        # Back copper layer
+├── ProjectName-In1_Cu.gbr      # Inner layer 1 (4+ layer boards)
+├── ProjectName-In2_Cu.gbr      # Inner layer 2 (4+ layer boards)
+├── 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 (SMT)
+├── ProjectName-B_Paste.gbr     # Back solder paste (SMT)
+├── ProjectName-Edge_Cuts.gbr   # Board outline/edge cuts
+├── ProjectName-job.gbrjob      # Gerber job file
+└── ProjectName-Gerbers-v1.0.zip # Packaged for submission
+```
+
+## Generating Production Gerbers
+1. Open your final PCB design (`.kicad_pcb`)
+2. **File → Fabrication Outputs → Gerbers**
+3. Configure settings:
+   - **Output directory**: `manufacturing/gerbers/`
+   - **Plot format**: Gerber
+   - **Include layers**: All copper, mask, silk, paste, edge cuts
+   - **Options**: Check "Use Protel filename extensions" if required
+4. Click **Plot**
+5. Click **Generate Drill Files** (saves to `/manufacturing/drill/`)
+
+## Quality Control Checklist
+- [ ] All required layers present
+- [ ] Board outline properly defined
+- [ ] No missing copper connections
+- [ ] Silkscreen doesn't overlap pads
+- [ ] Solder mask openings correct
+- [ ] Component references visible and readable
+- [ ] Drill holes align with pads
+- [ ] File sizes reasonable (not empty or corrupted)
+
+## Manufacturer Requirements
+Different manufacturers may require specific settings:
+- **File format**: RS-274X (standard)
+- **Units**: Millimeters (preferred) or inches
+- **Zero suppression**: Leading zeros suppressed
+- **Coordinate format**: 3.6 (mm) or 2.5 (inches)
+- **Aperture format**: Embedded apertures (standard)
+
+## Pre-submission Verification
+1. **Gerber Viewer**: Use KiCad Gerber Viewer or online tools
+2. **Layer Stack**: Verify correct layer order
+3. **Drill Alignment**: Check drill holes align with pads
+4. **Dimensions**: Verify board size and hole sizes
+5. **Manufacturer Check**: Use manufacturer's online Gerber viewer
+
+## Common Issues to Avoid
+- Missing edge cuts layer
+- Incorrect drill file format
+- Silkscreen over pads
+- Missing solder mask openings
+- Incorrect layer naming
+- Empty or corrupted files
+
+## Packaging for Submission
+Create a ZIP file containing:
+- All Gerber files (`.gbr`)
+- Gerber job file (`.gbrjob`)
+- Drill files (from `/manufacturing/drill/`)
+- README with specifications
+- BOM (from `/hardware/bom/`)
+
+## File Naming Convention
+Use consistent naming that matches your project:
+- `ProjectName-LayerName.gbr`
+- `ProjectName-v1.0-Gerbers.zip`
+- Include version numbers for tracking