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/code-resume.fish

@@ -0,0 +1,17 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function code-resume
+    if test -f .claude_session
+        set -l sid (cat .claude_session)
+        echo "Resuming Claude session: $sid"
+        claude --resume $sid
+    else if test -f .gemini_session
+        set -l sid (cat .gemini_session)
+        echo "Resuming Gemini session: $sid"
+        gemini --resume $sid
+    else
+        echo "No local AI session found. Opening picker..."
+        claude --resume # Default to Claude picker
+    end
+end