Add Python syntax compatibility workflow

[pzelasko]

Summary:

• add a lightweight GitHub Actions workflow that compiles every tracked Python file under Python 3.12 through 3.14
• trigger it on Python PR changes, manual dispatch, and workflow_call

Verification:

• git diff --check
• local syntax check: checked 1354 Python files with Python 3.13.12

[copy-pr-bot]

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[pzelasko]

/ok to test 5013015

[github-actions]

[🤖]: Hi @pzelasko 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.