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

conf.d/autopair.fish

@@ -0,0 +1,39 @@
+status is-interactive || exit
+
+set --global autopair_left "(" "[" "{" '"' "'"
+set --global autopair_right ")" "]" "}" '"' "'"
+set --global autopair_pairs "()" "[]" "{}" '""' "''"
+
+function _autopair_fish_key_bindings --on-variable fish_key_bindings
+    set --query fish_key_bindings[1] || return
+
+    test $fish_key_bindings = fish_default_key_bindings &&
+        set --local mode default insert ||
+        set --local mode insert default
+
+    bind --mode $mode[-1] --erase \177 \b \t
+
+    bind --mode $mode[1] \177 _autopair_backspace # macOS ⌫
+    bind --mode $mode[1] \b _autopair_backspace
+    bind --mode $mode[1] \t _autopair_tab
+
+    printf "%s\n" $autopair_pairs | while read --local left right --delimiter ""
+        bind --mode $mode[-1] --erase $left $right
+        if test $left = $right
+            bind --mode $mode[1] $left "_autopair_insert_same \\$left"
+        else
+            bind --mode $mode[1] $left "_autopair_insert_left \\$left \\$right"
+            bind --mode $mode[1] $right "_autopair_insert_right \\$right"
+        end
+    end
+end
+
+_autopair_fish_key_bindings
+
+function _autopair_uninstall --on-event autopair_uninstall
+    string collect (
+        bind --all | string replace --filter --regex -- "_autopair.*" --erase
+        set --names | string replace --filter --regex -- "^autopair" "set --erase autopair"
+    ) | source
+    functions --erase (functions --all | string match "_autopair_*")
+end