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/fzf.fish

@@ -0,0 +1,27 @@
+# fzf.fish is only meant to be used in interactive mode. If not in interactive mode and not in CI, skip the config to speed up shell startup
+if not status is-interactive && test "$CI" != true
+    exit
+end
+
+# Because of scoping rules, to capture the shell variables exactly as they are, we must read
+# them before even executing _fzf_search_variables. We use psub to store the
+# variables' info in temporary files and pass in the filenames as arguments.
+# This variable is global so that it can be referenced by fzf_configure_bindings and in tests
+set --global _fzf_search_vars_command '_fzf_search_variables (set --show | psub) (set --names | psub)'
+
+# Install the default bindings, which are mnemonic and minimally conflict with fish's preset bindings
+fzf_configure_bindings
+
+# Doesn't erase autoloaded _fzf_* functions because they are not easily accessible once key bindings are erased
+function _fzf_uninstall --on-event fzf_uninstall
+    _fzf_uninstall_bindings
+
+    set --erase _fzf_search_vars_command
+    functions --erase _fzf_uninstall _fzf_migration_message _fzf_uninstall_bindings fzf_configure_bindings
+    complete --erase fzf_configure_bindings
+
+    set_color cyan
+    echo "fzf.fish uninstalled."
+    echo "You may need to manually remove fzf_configure_bindings from your config.fish if you were using custom key bindings."
+    set_color normal
+end