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/ping.fish

@@ -0,0 +1,16 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function ping --description 'prettyping with default nolegend'
+    if command -q prettyping
+        # Check if the user specifically asked for the legend
+        if contains -- --legend $argv
+            command prettyping $argv
+        else
+            command prettyping --nolegend $argv
+        end
+    else
+        # Fallback to standard ping if prettyping isn't installed
+        command ping $argv
+    end
+end