[rascani]

When a project declares models but no kernel bundle, the component's configure
step now checks whether EXECUTORCH_PYTHON (set with -D or in the environment;
by default the Python ESP-IDF builds with) can import executorch. If it can, it
runs gen_kernels.py on the declared models into the build directory and uses
that bundle, so a project that exports and builds in one environment no longer
has to run gen_kernels.py or keep a bundle in its tree. The result is
byte-identical to a bundle made by hand, which CI checks by building the
ESP32-S3 smoke consumer this way. Without such a Python, or if generation
fails, the configure error names the Python, shows why, and prints the
gen_kernels.py command.

Authored with Claude Code.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24707

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 4c21d62 with merge base 60a8b5f ():

NEW FAILURE - The following job has failed:

• trunk / test-samsung-models-linux / linux-job (gh)
  test_w2l_fp16

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

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

• trunk / test-arm-backend-vkml (test_pytest_models_vkml) / linux-job (gh) (trunk failure)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

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