Complete GNU Guix packaging with manifest, channel, and module support

[Copilot]

This PR implements complete GNU Guix packaging for guile-llama-cpp, adding all the necessary files and structure for distribution via the Guix package manager.

Changes Made

Package Definition Improvements

• Enhanced guix.scm: Fixed package name to follow Guix conventions (guile-llama-cpp instead of guile_llama_cpp), added comprehensive synopsis and description, and included proper home-page URL
• Added missing imports: Fixed git-predicate import for proper source handling

New Guix Infrastructure Files

• .guix/modules/guile-package.scm: Modular package definition with proper exports for reusability across different Guix contexts
• .guix/manifest.scm: Development environment manifest including all build dependencies (autotools, SWIG, Guile 3.0, llama.cpp)
• .guix-channel: Channel definition enabling system-wide distribution and integration with Guix package management

Documentation and Usage

• .guix/README.md: Comprehensive guide covering all usage patterns including development environments, building, installation, and channel setup
• Updated main README.md: Added dedicated Guix section with multiple installation methods and clear examples

Usage Examples

Development Environment:

guix shell -m .guix/manifest.scm
# or
guix shell -D -f guix.scm

Building the Package:

guix build -f guix.scm

Installing the Package:

guix package -f guix.scm

Using as a Guix Channel:

;; Add to ~/.config/guix/channels.scm
(cons* (channel
         (name 'guile-llama-cpp)
         (url "https://git.savannah.nongnu.org/git/guile-llama-cpp.git")
         (branch "master"))
       %default-channels)

Benefits

• Multiple installation methods: Users can choose between standalone package installation, development environment setup, or system-wide channel integration
• Proper dependency management: All build and runtime dependencies are correctly specified
• GNU Guix best practices: Package follows naming conventions, includes complete metadata, and uses recommended file structure
• CPU-only llama.cpp: Uses CPU-only variant to avoid GPU dependencies and ensure broad compatibility

The implementation has been verified to include all required files and follow Guix packaging conventions, making guile-llama-cpp easily installable and developable on GNU Guix systems.

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