Canary: test ZMK main / Zephyr 4.1 with spare nice_nano

[rdlu]

Parent: #2

Note

Canary test to validate the ZMK main toolchain before attempting the full eyelash_sofle HWMv2 board migration.

Goal

Build and flash a settings_reset firmware targeting nice_nano//zmk on ZMK main to confirm Zephyr 4.1 works with the current toolchain (SDK 0.17.0).

Steps

• Create branch feat/hwmv2-canary from main
• Update config/west.yml: ZMK revision: main
• Update build.yaml: nice_nano//zmk + settings_reset shield (fall back to nice_nano@2.0.0//zmk if needed)
• Update .github/workflows/build.yml: workflow ref @main
• Push and verify GitHub Actions build succeeds
• Download .uf2 artifact and flash to spare nice_nano
• Confirm USB enumeration

Success criteria

• GitHub Actions build passes
• Firmware boots on real hardware (USB shows up)

If it fails

• Check Zephyr SDK 0.17.0 compatibility with Zephyr 4.1
• Check if reusable workflow on @main has different inputs
• Check ZMK Discord / GitHub issues for known breakage