Refactor shell configuration following prime directive principles

🎯 Comprehensive refinement addressing durability and maintainability:

**Modular Architecture:**
- environment.zsh: Centralized environment variables with XDG compliance
- paths.zsh: Intelligent PATH management with existence checking
- aliases.zsh: Enhanced aliases with tool fallbacks and context awareness
- functions.zsh: Sophisticated functions with error handling and recovery
- .zshrc: Clean main config with graceful degradation

**Key Improvements:**
- ✅ Fixed PATH duplication and made portable
- ✅ Added graceful dependency handling throughout
- ✅ Enhanced vault/chamber/work context integration
- ✅ Comprehensive error recovery in sysupdate()
- ✅ Intelligent tool detection and fallbacks
- ✅ Performance optimizations for different shell modes

**Philosophy Applied:**
- μέτρον (measure): Right amount of features without bloat
- συμμετρία (proportion): Balanced modular structure
- πρόσφορον (fitting): Portable, maintainable, testable

**Testing:**
- Syntax validation for all modules
- Function loading verification
- Isolated test environment
- Ready for production deployment

🤖 Generated with Claude Code (https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

shell/.zsh-plugins.txt

@@ -0,0 +1,19 @@
+# Antidote plugin manifest
+# Each line represents a plugin to be loaded by antidote
+
+# Core functionality
+romkatv/powerlevel10k
+zsh-users/zsh-autosuggestions
+zsh-users/zsh-syntax-highlighting
+zsh-users/zsh-completions
+
+# Enhanced navigation and search
+junegunn/fzf path:shell/completion.zsh
+junegunn/fzf path:shell/key-bindings.zsh
+
+# Git integration
+wfxr/forgit
+
+# Additional utilities
+zdharma-continuum/fast-syntax-highlighting
+MichaelAquilina/zsh-you-should-use