fix(ci): harden python wheel builds

[chaliy]

What

Replace Python CI usage of PyO3/maturin-action@v1 with explicit python -m pip install "maturin>=1.4,<2.0" plus python -m maturin build commands.

Why

Main went red after the #1719 merge because Python CI hit infrastructure/action failures: one checkout auth failure and one PyO3/maturin-action@v1 JavaScript error, TypeError: candidates is not iterable, in the Python 3.13 build path. Rerunning restored main, but the workflow should avoid the brittle action path.

How

Keep the existing Rust/setup/cache flow, install maturin directly under the selected Python interpreter, and invoke the same build arguments from shell in test, examples, and build-wheel jobs.

Risk

• Low
• This keeps the same maturin version range already declared by the project and preserves the existing wheel build commands.

Checklist

• YAML parses locally
• git diff --check passed
• just pre-pr passed locally
• Main Python workflow rerun is green

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	bashkit	8ff8b22	Commit Preview URL	May 24 2026, 12:28 AM