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/superpowers.fish

@@ -0,0 +1,49 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function superpowers --description "Toggle superpowers extension for Gemini and Claude"
+    set -l scope_gemini workspace
+    set -l scope_claude project
+    set -l mode ""
+    set -l help_text "
+Usage: superpowers [on|off] [options]
+
+Commands:
+  on       Enable superpowers for Gemini and Claude
+  off      Disable superpowers for Gemini and Claude
+
+Options:
+  -g, --global    Apply settings to the user/global scope
+  -h, --help      Show this help message
+"
+
+    # Parse arguments
+    for arg in $argv
+        switch $arg
+            case on
+                set mode enable
+            case off
+                set mode disable
+            case -g --global
+                set scope_gemini user
+                set scope_claude user
+            case -h --help
+                echo $help_text
+                return 0
+        end
+    end
+
+    # Handle no arguments or invalid mode
+    if test -z "$mode"
+        echo $help_text
+        return 1
+    end
+
+    echo "Setting superpowers to: $mode (Scope: Gemini=$scope_gemini, Claude=$scope_claude)..."
+
+    # Execute Gemini command
+    gemini extensions $mode superpowers --scope $scope_gemini
+
+    # Execute Claude command
+    claude plugins $mode superpowers --scope $scope_claude
+end