Hardware V0.1 - ordered baseline

Hardware V0.1 is the immutable state that was ordered. It maps the public
hardware version V0.1 to KiCad CAD revision R4 and commit f9510e7.

Ordering

Use IR_Spoke_Sensor_V0.1_2L_ORDER_PACKAGE.zip as the complete archived
reference. For JLCPCB upload:

1. Upload IR_Spoke_Sensor_V0.1_2L_GERBER.zip for PCB fabrication.
2. Upload IR_Spoke_Sensor_V0.1_2L_BOM.csv and
   IR_Spoke_Sensor_V0.1_2L_CPL.csv for top-side assembly.
3. Apply the parameters in IR_Spoke_Sensor_V0.1_2L_ORDER.json.
4. Do not upload the courtyard-reference archive as production Gerbers.
5. Verify diode polarity and all rotations in the JLCPCB assembly preview.

The combined order package also contains the cable BOM, interactive BOM, DRC
evidence and SHA-256 checksums. The separate PCBA archive contains BOM, CPL and
order metadata for convenient retention.

Verified release state

• Two-layer, 1.6 mm FR-4, 1 oz copper.
• KiCad DRC: 0 violations and 0 unconnected pads.
• BOM/CPL: 20 BOM rows and 24 placements with matching designators.
• 44 footprints and 70 canonical schematic/netlist endpoints checked.
• Receiver carrier: 17.8 x 21.4 mm.
• Breakaway emitter: 21 x 15 mm with two M2.5 holes.
• One conductive mouse-bite tab carries temporary 3V3 and LED_K links.

This is an ordered engineering prototype. Physical optical, environmental,
vibration and power validation remains open.

Independent software version

This hardware release does not release firmware. Software uses independent
SW-Vx.y.z tags; the repository firmware remains SW-V0.1.0-dev.