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/environment.zsh

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+# ░█▀▀░█▀█░█░█░▀█▀░█▀▄░█▀█░█▀█░█▄█░█▀▀░█▀█░▀█▀
+# ░█▀▀░█░█░▀▄▀░░█░░█▀▄░█░█░█░█░█░█░█▀▀░█░█░░█░
+# ░▀▀▀░▀░▀░░▀░░▀▀▀░▀░▀░▀▀▀░▀░▀░▀░▀░▀▀▀░▀░▀░░▀░
+
+# Core environment variables with graceful fallbacks
+
+# 🖋 Preferred editors
+export EDITOR="${EDITOR:-bbedit}"
+export VISUAL="${VISUAL:-bbedit}"
+
+# 🌍 Locale settings
+export LANG="${LANG:-en_US.UTF-8}"
+export LC_ALL="${LC_ALL:-en_US.UTF-8}"
+
+# 🗂 History configuration  
+export HISTFILE="${HISTFILE:-$HOME/.zsh_history}"
+export HISTSIZE=100000
+export SAVEHIST=100000
+
+# 🧠 XDG Base Directory specification
+export XDG_CONFIG_HOME="${XDG_CONFIG_HOME:-$HOME/.config}"
+export XDG_DATA_HOME="${XDG_DATA_HOME:-$HOME/.local/share}"
+export XDG_CACHE_HOME="${XDG_CACHE_HOME:-$HOME/.cache}"
+export XDG_STATE_HOME="${XDG_STATE_HOME:-$HOME/.local/state}"
+
+# 📚 Vault and workspace paths
+export VAULT_PATH="$HOME/Library/Mobile Documents/iCloud~md~obsidian/Documents/David, root-and-branch"
+export CHAMBER_PATH="$HOME/animal-davidglidden-eu"
+export WORK_PATH="$HOME/Documents/GitHub/davidglidden.github.io"
+export DOTFILES_PATH="$HOME/dotfiles"
+
+# 🔧 Tool configurations
+export HOMEBREW_NO_ANALYTICS=1
+export HOMEBREW_NO_INSECURE_REDIRECT=1
+export HOMEBREW_CASK_OPTS="--require-sha"
+
+# 🎨 Color and display
+export CLICOLOR=1
+export LSCOLORS="ExGxBxDxCxEgEdxbxgxcxd"
+export GREP_OPTIONS="--color=auto"
+
+# 🐍 Python settings
+export PYTHONDONTWRITEBYTECODE=1
+export PYTHONUNBUFFERED=1
+
+# 📊 Performance monitoring
+export TIMEFMT=$'\n================\nCPU\t%P\nuser\t%*U\nsystem\t%*S\ntotal\t%*E'
+
+# 🌓 Optional API keys (with existence checks)
+[[ -f "$HOME/.env.local" ]] && source "$HOME/.env.local"
+
+# 🔐 Security
+export GPG_TTY=$(tty)
+
+# 🚀 Development context detection
+detect_context() {
+    case "$PWD" in
+        "$WORK_PATH"*) export CURRENT_CONTEXT="work" ;;
+        "$CHAMBER_PATH"*) export CURRENT_CONTEXT="chamber" ;;
+        "$VAULT_PATH"*) export CURRENT_CONTEXT="vault" ;;
+        "$DOTFILES_PATH"*) export CURRENT_CONTEXT="dotfiles" ;;
+        *) export CURRENT_CONTEXT="personal" ;;
+    esac
+}