feat(guards): add opinionated component guards to config.fish and conf.d

Adds __fish_config_op_enabled helper (master __fish_config_opinionated
evaluated first via __fish_variable_check, then the category variable)
and gates C1-C4 components: CachyOS surgical override, PAGER/MANPAGER,
CDPATH, Vi mode, exit override, bang-bang bindings, history/cp/mv/wget/
grep aliases, cd->z alias, Fisher bootstrap and theme apply, paru/yay
wrapper generation, WakaTime hook, custom key chords, puffer, autopair,
starship prompt, Catppuccin colors, FZF_DEFAULT_OPTS, done notifications,
and Kitty/WezTerm window-management abbreviations.

conf.d/done.fish

@@ -24,6 +24,10 @@ if not status is-interactive
     exit
 end
 
+# Local modification: opinionated guard (AGENTS.md Task #3). Desktop
+# notifications assume a graphical session, classified as C4 integrations.
+__fish_config_op_enabled __fish_config_op_integrations; or exit
+
 set -g __done_version 1.19.1
 
 function __done_run_powershell_script