Publish Linux wheels for x86_64 only; keep source distribution for non-x86 local builds

[Copilot]

This updates Python packaging so PyPI only serves prebuilt binary wheels for x86_64. ARM/aarch64 users will no longer receive a precompiled wheel and will instead fall back to local build from source via pip.

• Release workflow scope

  • Removed multi-arch wheel matrix entries for Linux publishing.
  • Set wheel build target explicitly to x86_64.

• Source-build fallback for unsupported architectures

  • Added maturin sdist output to the release artifacts.
  • publish job still uploads dist/*, now including both x86_64 wheel(s) and sdist, enabling pip source install on aarch64.

• Net effect

  • x86_64: prebuilt wheel with bundled binary.
  • aarch64: no ARM wheel on PyPI; install path is local compilation from sdist.

- name: Build wheel
  uses: PyO3/maturin-action@v1
  with:
    target: x86_64
    args: --release --out dist
    manylinux: auto

- name: Build source distribution
  uses: PyO3/maturin-action@v1
  with:
    command: sdist
    args: --out dist

---

🔒 GitHub Advanced Security automatically protects Copilot coding agent pull requests. You can protect all pull requests by enabling Advanced Security for your repositories. Learn more about Advanced Security.