ad3002/aindex: Release v1.4.0: Complete emphf integration with macOS compatibility

🚀 Major Release: Complete emphf Integration

✨ Key Features

• Complete emphf integration: All sources now local in src/emphf
• Zero external dependencies: No more cmake, git, or external repo requirements
• Cross-platform compatibility: Native builds for Linux x86_64/ARM64, macOS x86_64/ARM64
• macOS compatibility: POSIX-compatible filesystem operations for macOS < 10.15
• Simplified build system: Single Makefile handles all platforms and architectures

🔧 Technical Improvements

• Replaced std::filesystem with POSIX-compatible code for broader macOS support
• Fixed delocate wheel repair conflicts on macOS builds
• Architecture-specific build optimizations for ARM64
• Streamlined CI/CD pipeline with faster, more reliable builds

🏗️ Build System

• Local sources only: All dependencies bundled in repository
• Native compilation: No cross-compilation complexity
• Automatic architecture detection: Builds optimal version for target platform
• Faster CI/CD: Reduced build times and improved reliability

📦 Distribution

• Python wheels for all major platforms and architectures
• Source distribution with complete build environment
• Compatible with Python 3.8-3.12

This release represents a complete rewrite of the build system for maximum compatibility and ease of use.