Refactor Zsh configuration to use Antidote plugin manager with zdotdir structure

[Copilot]

Overview

This PR refactors the Zsh configuration to follow the modular structure from mattmc3/zdotdir, implementing a modern, maintainable setup using the Antidote plugin manager.

Problem

The repository previously had only a single dot_zshenv file without a proper $ZDOTDIR structure, making it difficult to:

• Organize Zsh configuration modularly
• Manage plugins declaratively
• Extend functionality with custom functions and completions
• Follow modern Zsh best practices

Solution

Created a complete $ZDOTDIR structure at ~/.config/zsh with:

Core Configuration Files

• .zshrc - Interactive shell configuration with built-in profiling support via zprofrc alias
• .zshenv - Environment variables, XDG directory setup, and automatic directory creation
• .zstyles - Centralized zstyle configuration for plugins and features
• .zsh_plugins.txt - Declarative plugin list for Antidote (includes syntax highlighting, autosuggestions, completions, etc.)

Infrastructure

• lib/antidote.zsh - Antidote plugin manager loader with automatic installation
• conf.d/__init__.zsh - Initial configuration module for environment setup and PATH management
• functions/ - Directory for custom Zsh functions (extensible)
• completions/ - Directory for custom completion scripts (extensible)

Documentation

• dot_config/zsh/README.md - Comprehensive guide covering structure, plugin management, and usage
• Updated main README.md - Added Antidote to tooling overview and Zsh configuration section

Key Benefits

Modularity - Configuration is organized into logical, single-purpose files rather than one monolithic file

Plugin Management - Antidote provides fast, declarative plugin loading from .zsh_plugins.txt instead of manual sourcing

Extensibility - Easy to add new plugins, functions, and configurations without modifying core files

Performance - Includes profiling tools and follows performance best practices

Standards Compliance - Follows XDG Base Directory specification and proven Zsh community patterns

chezmoi Compatible - Works seamlessly with existing dotfile management using dot_ prefix conventions

Example Usage

Adding a plugin:

# Edit ~/.config/zsh/.zsh_plugins.txt
echo "username/plugin-repo" >> ~/.config/zsh/.zsh_plugins.txt
exec zsh  # Reload to apply

Adding custom configuration:

# Create a new config module
echo "alias myalias='command'" > ~/.config/zsh/conf.d/aliases.zsh

Profiling startup performance:

zprofrc  # Starts profiled session and shows results

Testing

The structure follows the proven pattern from mattmc3/zdotdir. All configuration files use standard Zsh syntax and are compatible with modern Zsh versions. The implementation is minimal and focused, changing only what's necessary to establish the new structure.

Migration Notes

For users applying these dotfiles:

1. Antidote will be automatically cloned on first shell startup
2. Plugins defined in .zsh_plugins.txt will be loaded automatically
3. The root ~/.zshenv now sources $ZDOTDIR/.zshenv for layered configuration
4. All existing functionality is preserved while adding new capabilities

Fixes the issue by implementing the requested zdotdir structure refactor.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Antidote Refactor</issue_title>
<issue_description>Refactor the codebase to use the same structure as https://github.com/mattmc3/zdotdir</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #18

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