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/zoxide.fish

@@ -63,7 +63,11 @@ if status is-interactive
 
         # -------------
 
-        alias cd=z
+        # Shadowing cd with zoxide is opinionated (C1 aliasing); z and zi
+        # remain available either way.
+        if __fish_config_op_enabled __fish_config_op_aliases
+            alias cd=z
+        end
 
         # use custom completion
         complete -c z -f # disable files by default