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/_puffer_fish_expand_star.fish

@@ -0,0 +1,15 @@
+function _puffer_fish_expand_star
+    if commandline --search-field >/dev/null
+        commandline --search-field --insert '*'
+    else if string match --quiet -- '!' "$(commandline --current-token)"
+        set -l prev_cmd $history[1]
+        set -l prev_args (string split ' ' $prev_cmd)
+        set -e prev_args[1]  # remove command name
+        set -l arg_str (string join ' ' $prev_args)
+        # replace !* with all arguments
+        commandline --current-token ''
+        commandline --insert $arg_str
+    else
+        commandline --insert '*'
+    end
+end