feat: enable building as py3-none wheel

[donn]

• update release CI to build wheels instead of tarballs
• adapt wheel_build from silisizer
• add brewfile for dependencies
• update codebase to better handle relocation and allow all tests to pass with wheel installation
• fix missing header include in driver/main.c

---

TODO

• Ensure Linux works

[greptile-apps]

Greptile Summary

This PR introduces relocatable, Python-version-independent binary wheels for Icarus Verilog and updates release and test automation accordingly.

• Adds a custom PEP 517 wheel backend, package entry points, platform tagging, and smoke tests.
• Builds and tests Linux x86-64 and macOS arm64 wheels before publishing them to GitHub and the Silimate download server.
• Adds relocatable runtime include/library discovery for the driver and VPI helper.
• Updates macOS dependencies and installation tooling.

Confidence Score: 4/5

The implementation appears functionally safe, but the repository’s explicit documentation requirement for build_sdist must be satisfied before merging.

The only remaining issue is that the complex sdist construction and filtering function lacks the purpose documentation required by the repository. All six previous findings were manually resolved without explanatory replies and therefore are not outstanding.

Files Needing Attention: wheel_build/init.py

Important Files Changed

Filename	Overview
wheel_build/init.py	Implements the custom wheel backend, metadata generation, build bootstrap, native compilation, and wheel assembly; build_sdist lacks the purpose documentation required by repository rules.
.github/workflows/release.yml	Replaces tarball releases with a tested cibuildwheel matrix and gated release/upload jobs.
driver/driver_portable.cc	Resolves runtime include and library paths relative to the relocated executable prefix.
driver/Makefile.in	Adds the portable C++ driver object and links the driver with the configured C++ compiler.
.github/workflows/test.yml	Centralizes macOS dependencies in the Brewfile and regenerates Autoconf inputs before building.
install-sh	Updates the fallback installation helper to a current GNU Automake implementation compatible with existing installation rules.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Push or pull request] --> B[Determine unused wheel version]
    B --> C{Build matrix}
    C --> D[Linux manylinux build]
    C --> E[macOS arm64 build]
    D --> F[Repair and smoke-test wheel]
    E --> F
    F --> G[Install wheel and run full tests]
    G --> H[Upload wheel artifacts]
    H --> I{Pull request?}
    I -->|Yes| J[Finish validation]
    I -->|No| K[Create GitHub prerelease]
    K --> L[Upload to download server]

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_{Reviews (4): Last reviewed commit: "ci: update macos upstream test" | Re-trigger Greptile}

[donn]

@greptile-apps re-review