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/puffer.fish

@@ -1,5 +1,10 @@
 status is-interactive || exit
 
+# Local modification: opinionated guard (AGENTS.md Task #3). Puffer's key
+# intercepts are part of the bang-bang system, gated atomically under C3
+# overrides with conf.d/tricks.fish, conf.d/abbr.fish, and expand_*.fish.
+__fish_config_op_enabled __fish_config_op_overrides || exit
+
 function _puffer_fish_key_bindings --on-variable fish_key_bindings
     set -l modes
     if test "$fish_key_bindings" = fish_default_key_bindings