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/theme.fish

@@ -6,6 +6,16 @@
 #          ╰──────────────────────────────────────────────────────────╯
 # Catppuccin Mocha
 
+# Forcing theme colors and $FZF_DEFAULT_OPTS is opinionated (C3 overrides).
+# The FZF variable is universal, so clean up our Catppuccin value if it
+# lingers from a session where overrides were still enabled.
+if not __fish_config_op_enabled __fish_config_op_overrides
+    if set -q FZF_DEFAULT_OPTS; and string match -q '*#1E1E2E*' -- "$FZF_DEFAULT_OPTS"
+        set --erase FZF_DEFAULT_OPTS
+    end
+    return
+end
+
 #   ────────────────────── Syntax highlighting colors ──────────────────────
 set --global fish_color_autosuggestion 6c7086
 set --global fish_color_cancel f38ba8