feat: initial fish shell configuration

- Core config layered on CachyOS base with Catppuccin Mocha theming
- Fisher plugins: fzf.fish, catppuccin, autopair, replay, puffer-fish, magic-enter, spark
- Smart CLI wrappers with fallbacks (bat, lsd, btop, dust, prettyping)
- Custom functions: git, docker, network, kitty, AI session management
- Extensive abbreviation system for keyboard-driven workflows
- Secrets/local sourcing pattern for private and machine-specific config
- README with full documentation and personalization guide
- AGPLv3+ license with copyright headers on all source files

functions/cleanup.fish

@@ -0,0 +1,16 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function cleanup -d "Log orphans to ~/.removed_orphans and remove them"
+    set -l orphans (pacman -Qtdq)
+    if test -n "$orphans"
+        echo "📝 Logging orphans to ~/.removed_orphans..."
+        echo "--- Removed on $(date) ---" >> ~/.removed_orphans
+        pacman -Qi $orphans | grep -E '^(Name|Version)' >> ~/.removed_orphans
+        
+        echo "🧹 Removing orphans..."
+        sudo pacman -Rns $orphans
+    else
+        echo "✨ No orphans to clean up!"
+    end
+end