Add project status doc - ready for prototype order

docs/PROJECT_STATUS.md

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+# SN-L00 Project Status
+
+**Last Updated**: 2026-01-23
+
+## Current State: Ready for Prototype Order
+
+### Completed
+
+- [x] Schematic design (KiCad 9)
+- [x] PCB layout 8HP (40×100mm)
+- [x] Automated routing pipeline (`python3 scripts/autoroute.py`)
+- [x] Panel design aligned with PCB
+- [x] M3 standoff mounting system
+- [x] Gerber files generated
+- [x] Firmware source code
+
+### Manufacturing Files
+
+| File | Description |
+|------|-------------|
+| `hardware/kicad/SN-L00-gerbers.zip` | Upload to PCB fab (JLCPCB/PCBWay) |
+| `hardware/kicad/gerbers/SN-L00-pos.csv` | Pick and place file |
+| `hardware/panel/SN-L00_panel.svg` | Panel for laser cutting |
+| `hardware/BOM.md` | Bill of materials with LCSC parts |
+
+### DRC Status
+
+- **0 unconnected pads** ✓
+- 6 courtyard overlaps (cosmetic - acceptable)
+- 1 edge clearance warning (manufacturable)
+
+### Next Steps
+
+1. **Order PCBs**
+   - Upload `SN-L00-gerbers.zip` to JLCPCB or PCBWay
+   - Specs: 2-layer, 40×100mm, 1.6mm, HASL, green/black solder mask
+   - Qty: 5-10 for prototyping
+
+2. **Order Panel**
+   - Option A: PCB panel (order as PCB, black soldermask)
+   - Option B: Laser cut aluminum (use SVG)
+   - Option C: Laser cut acrylic
+
+3. **Order Components**
+   - See `hardware/BOM.md` for LCSC part numbers
+   - Hand-solder: RP2040-Zero module, OLED module
+
+4. **Build Firmware**
+   ```bash
+   cd firmware
+   mkdir build && cd build
+   cmake .. && make
+   ```
+   Flash `sn_l00.uf2` via USB bootloader
+
+5. **Assembly**
+   - SMD assembly (or hand solder SMD parts)
+   - Solder through-hole: jacks, button, headers
+   - Mount PCB to panel with M3×10mm standoffs
+   - Connect OLED module
+
+6. **Testing**
+   - Power on test (check 3.3V rail)
+   - OLED display test
+   - Latency measurement validation
+
+### Hardware Required for Assembly
+
+| Item | Qty | Notes |
+|------|-----|-------|
+| M3×10mm standoff | 4 | Hex, male-female |
+| M3×6mm screw | 4 | Pan head |
+| M3 nut | 4 | For panel side |
+| RP2040-Zero | 1 | Waveshare module |
+| OLED 128×32 | 1 | 0.91" I2C module |
+
+### Repository
+
+- **Git**: https://git.sub-net.at/submodular/SN-L00
+- **Org**: https://git.sub-net.at/submodular
+
+### Quick Commands
+
+```bash
+# Regenerate PCB routing
+cd hardware/kicad
+python3 scripts/autoroute.py
+
+# Regenerate Gerbers
+./scripts/export_gerbers.sh
+
+# Build firmware
+cd firmware && mkdir -p build && cd build && cmake .. && make
+```