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/cb.fish

@@ -0,0 +1,21 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function cb --description 'Copy to clipboard'
+    if type -q wl-copy
+        if set -q argv[1]
+            echo $argv | wl-copy
+        else
+            wl-copy
+        end
+    else if type -q xclip
+        if set -q argv[1]
+            echo $argv | xclip -selection clipboard
+        else
+            xclip -selection clipboard
+        end
+    else
+        echo "Error: No clipboard provider found." >&2
+        return 1
+    end
+end