feat: switch release assets to darwin tarballs

[glitch418x]

Summary

• replace universal/raw binaries with architecture-specific tar.gz release assets
• publish checksums.txt with release assets for Homebrew verification

Validation

• cargo fmt --check
• cargo clippy
• cargo test

Summary by CodeRabbit

• Chores
  • macOS releases now distributed as separate builds for Apple Silicon and Intel architectures instead of universal binaries.
  • Added SHA256 checksums for release integrity verification.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The GitHub Actions release workflow is refactored to package macOS binaries separately per architecture (arm64 and amd64) as individual tar.gz artifacts with checksums, replacing the previous universal binary approach.

Changes

Cohort / File(s)

Summary

macOS Release Packaging .github/workflows/release.yml

Modified artifact packaging to create separate architecture-specific distributions for macOS. Extracts VERSION from git tag, creates dist/arm64 and dist/amd64 directories, copies built binaries to architecture-specific folders, generates individual tar.gz archives for each architecture, creates SHA256 checksums, and updates release upload to reference architecture-specific artifacts instead of universal binary.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Two architectures in separate tar bundles bright,
Arm and amd64, each packaged just right,
With checksums to verify, no universal compromise,
Separate releases of beautiful binaries arise! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/release-binary-first

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