feat: create free-threaded python wheels#1553
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The free-threaded matrix entries skip `uv sync` to avoid resolving project dependencies against cp313t/cp314t (many dev deps lack free-threaded wheels), so `uv run --no-project maturin` failed on macOS/Windows with "Failed to spawn: `maturin`". Switch to `uvx maturin@1.8.1`, which runs maturin in an isolated tool env independent of the project venv and matches the pin used by maturin-action for manylinux builds. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Which issue does this PR close?
Closes #1324
Rationale for this change
Starting in Python 3.14 free-threaded support is no longer experimental.
What changes are included in this PR?
Update build to support free-threaded Python wheels.
Are there any user-facing changes?
None