Summary: Add MCU model verification to CI

[psiddh]

Test Plan: OSS CI

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Summary

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Test plan

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13572

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❌ 4 New Failures, 1 Cancelled Job, 1 Unrelated Failure

As of commit f77b37c with merge base ffb47e3 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• trunk / test-models-macos-coreml (emformer_transcribe) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 139
• trunk / test-models-macos-coreml (ic4) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 139
• trunk / test-models-macos-cpu (ic4, xnnpack-quantization-delegation) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 139

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-huggingface-transformers-coreml (qwen3-1.7b|xnnpack|--quantize) / macos-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Apple / build-benchmark-app / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 65

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[digantdesai]

Looks good. Kicked them off on the CI. Let's see how long the job takes else we can reduce the number of models running serially on the job or somehow run them in parallel.

[psiddh]

Looks good. Kicked them off on the CI. Let's see how long the job takes else we can reduce the number of models running serially on the job or somehow run them in parallel.

Looks like job passed : https://github.com/pytorch/executorch/actions/runs/17146863588/job/48644753234?pr=13572

════════════════════════════════════════════════════════════════
🏁 MCU MODEL VALIDATION SUMMARY - TARGET: ethos-u85-128
════════════════════════════════════════════════════════════════

lstm : ✅ Passed
mv2 : ✅ Passed
mv3 : ✅ Passed
resnet18 : ✅ Passed