Add CI/CD workflows with multi-platform builds and artifact distribution

[Copilot]

Implements automated builds and binary distribution for the macf CLI tool.

Changes

• Build workflow (.github/workflows/build.yml)

  • Triggers on push/PR to main/master
  • Matrix builds: Linux x86_64, macOS Intel, macOS Apple Silicon
  • Uploads artifacts with 90-day retention
  • Includes smoke tests for all output formats

• Release workflow (.github/workflows/release.yml)

  • Triggers on v*.*.* tags
  • Creates platform-specific tarballs
  • Automatically attaches to GitHub releases

• Documentation (README.md)

  • Added build badge
  • Download instructions for Actions artifacts and releases
  • Platform-specific installation steps

• Security

  • Explicit GITHUB_TOKEN permissions (read for builds, write for releases)

• Project cleanup (.gitignore)

  • Excludes build artifacts and common dev files

Distribution

Users can download pre-built binaries from:

• Actions tab → latest successful build → platform artifact
• Releases page → macf-{platform}-{arch}.tar.gz

Repository owners can create releases by pushing version tags:

git tag v1.0.0 && git push origin v1.0.0

Original prompt

Please add automated builds and allow users to download results

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