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/key_bindings.fish

@@ -46,6 +46,10 @@
 
 function fish_user_key_bindings
 
+    # Custom key chords are opinionated (C3 overrides); skip them entirely
+    # when overrides are disabled so stock bindings remain untouched.
+    __fish_config_op_enabled __fish_config_op_overrides; or return
+
     #   ───────────────────────────── Set Bindings ─────────────────────────────
     #
     # Set Emacs mode bindings: