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/top.fish

@@ -0,0 +1,14 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function top --wraps=btop --description 'Use btop as a modern replacement for top'
+    # 1. Check if btop is actually installed
+    if type -q btop
+        # 2. Launch btop with any arguments passed
+        btop $argv
+    else
+        # 3. Fallback to the original system top if btop is missing
+        echo "btop not found, falling back to classic top..."
+        command top $argv
+    end
+end