Pin amy to c4c3df735 (amy#1137) - #1337

🔌 AMYboard PR preview

Editor + flasher: https://amyboard-pr-1337.vercel.app/editor/

This preview bundles this PR's firmware — its flasher only flashes this build (not the release). Rebuilt on every push; removed when the PR closes.

The hardware CI has been kicked off and should return within a few minutes, stand by!

🌷 Tulip Web PR preview

Tulip Web: https://tulip-pr-1337.vercel.app/run/

Flash a Tulip to this build: on-device run tulip.upgrade(pr=1337).

Rebuilt on every push; removed when the PR closes.

🎛️ HW CI (physical bench)

AMYboard (USB-MIDI + AMY zP → audio; built-in tones + AMYboard World sketches acid/house/woodpiano over the SysEx control API): ❌ FAIL — a check did not match, or the run errored. See the log/artifacts.

Tulip (TULIP4_R11; serial-REPL audio + WiFi screenshot): ❌ FAIL — a check did not match, or the run errored. See the log/artifacts.

⬇️ Artifacts: recordings · screenshot · serial logs · run logs

_{Self-hosted bench. Audio spectral-compared to ref/hwci_basic.wav, the AMYboard World sketch refs (ref/{acid_generator,house_generator,woodpiano}.wav) + ref/tulip_basic.wav; Tulip screenshot pixel-compared to ref/tulip_screenshot.png. Both analog outs share one capture card, so the tests run sequentially.}