Add Python 3.14 support

[manuelcandales]

Add Python 3.14 to wheel build matrices, pyproject.toml classifiers, requires-python range, black target versions, and documentation.

Note: the tokenizers submodule (extension/llm/tokenizers) needs a separate update in its own repo.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18278

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 17 New Failures, 17 Pending, 2 Unrelated Failures

As of commit f098e10 with merge base dff7d78 ():

NEW FAILURES - The following jobs have failed:

• Build Aarch64 Linux Wheels / pytorch/executorch / build-wheel-py3_14-cpu-aarch64 (gh)
  /tmp/pip-install-od7zefwy/scipy_bf5625e52fc4409f98fbac774cb7a85a/.mesonpy-qtw0o30c/meson-private/tmpk_7g37y8/testfile.c:5:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'foo'
• Build Aarch64 Linux Wheels / pytorch/executorch / upload / upload-wheel-py3_14-cpu-aarch64 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_aarch64
• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_14-cpu (gh)
  /tmp/pip-install-i9dboo0r/scipy_fca721e878cd4f0cb047ebbfb4c14461/.mesonpy-980wrhqf/meson-private/tmpa0qyupy8/testfile.c:5:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'foo'
• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_14-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_x86_64
• Build macOS Wheels / pytorch/executorch / build-wheel-py3_14-cpu (gh)
  Process completed with exit code 1.
• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_14-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh)
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_11-cpu (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_12-cpu (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_13-cpu (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_14-cpu (gh)
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x64
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_11-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.11_cpu_x64
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_12-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.12_cpu_x64
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_13-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.13_cpu_x64
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_14-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_x64
• pull / unittest-editable / windows / windows-job (gh)
  Process completed with exit code 1.

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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