Add comprehensive Homebrew formula support for macOS and Linux

[Copilot]

This PR adds comprehensive Homebrew formula support for the needs CLI tool, enabling easy installation on both macOS and Linux systems.

What's Added

🍺 Homebrew Formula Files

• needs.rb - Main formula for development/testing (builds from master branch)
• needs-release.rb - Production-ready template for GitHub releases
• needs-advanced.rb - Enhanced formula with additional UX features

📚 Documentation

• HOMEBREW.md - Comprehensive formula documentation
• INSTALL.md - User-friendly installation guide
• HOMEBREW_SUMMARY.md - Implementation summary and maintenance guide
• Updated README.md with Homebrew installation instructions

🧪 Testing & Validation

• test-formula.sh - Comprehensive test suite that validates:
  • Formula structure and Ruby syntax
  • Build process verification
  • Binary functionality testing
  • Cross-platform compatibility
  • Error handling

Installation Methods

Method 1: Local Installation (Current)

git clone https://github.com/NQMVD/needs.git
cd needs
brew install --build-from-source ./needs.rb

Method 2: Direct URL (Future)

brew install https://raw.githubusercontent.com/NQMVD/needs/master/needs.rb

Method 3: Homebrew Tap (Recommended)

brew tap NQMVD/needs
brew install needs

Platform Support

✅ macOS: Intel (x86_64) and Apple Silicon (ARM64)
✅ Linux: x86_64 (via Homebrew on Linux)

Key Features

• Automatic dependency handling - Rust installed as build dependency
• Comprehensive testing - Validates installation and functionality
• Multiple variants - Basic, release, and advanced formulas
• Production-ready - Follows Homebrew best practices
• Excellent documentation - Clear installation and usage guides

Usage After Installation

# Check if specific binaries are available
needs git cargo rust

# Fast check without versions
needs --no-versions git cargo rust

# Use with needsfile
echo "git\ncargo\nrust" > needsfile
needs

# Quiet mode for scripting
needs --quiet git cargo rust

Testing Results

All formulas pass comprehensive validation:

• ✅ Ruby syntax validation
• ✅ Formula structure validation
• ✅ Build process verification
• ✅ Binary functionality testing
• ✅ Cross-platform compatibility
• ✅ Error handling validation

Future Enhancements

Once GitHub releases are available, the formula can be updated to use release tarballs with SHA256 verification for even better security and reproducibility.

Closes the issue requesting Homebrew flask support for macOS and Linux.

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