feat: enable building as py3-none wheel

[donn]

• update release CI to build wheels instead of tarballs

---

TODO:

• fix macOS build
• fix tclreadline's availability

[greptile-apps]

Greptile Summary

This PR replaces native release tarballs with platform-specific Python wheels and adds a custom PEP 517 backend that packages the Silisizer executable and Tcl runtime.

• Builds and smoke-tests Linux x86_64 and macOS arm64 wheels through cibuildwheel.
• Adds wheel metadata, console-script integration, native dependency preparation, and release publishing.
• Updates CMake and Homebrew configuration for Tcl readline discovery across supported platforms.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/release.yml	Replaces tarball publication with cibuildwheel-based Linux and macOS wheel builds, an installed-wheel smoke test, and wheel publishing.
wheel_build/init.py	Implements the PEP 517 backend, native build orchestration, Tcl runtime packaging, metadata generation, and checksum-verified CUDD fallback.
wheel_build/silisizer/main.py	Adds the installed console entry point that configures the bundled Tcl runtime and executes the packaged native binary.
CMakeLists.txt	Moves Tcl readline discovery into a dedicated CMake module and uses the repository-level module directory.
cmake/FindTclReadline.cmake	Encapsulates Tcl readline library and header discovery for native and wheel builds.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Source[Silisizer source] --> Backend[Custom PEP 517 backend]
  Backend --> Native[CMake native build]
  Backend --> Tcl[Tcl runtime files]
  Native --> Wheel[Platform wheel]
  Tcl --> Wheel
  Wheel --> Test[Isolated cibuildwheel smoke test]
  Test --> Artifact[Uploaded wheel artifact]
  Artifact --> Release[GitHub release and download server]

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_{Reviews (4): Last reviewed commit: "bugfix: integrity check if wheel_build i..." | Re-trigger Greptile}

[donn]

@greptile-apps re-review. ignore the release race for now- only one branch does releases