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/tricks.fish

@@ -29,7 +29,8 @@ if test -f $_src; and not test -L $_man1/fish-config.1
 end
 
 # Format man pages using bat (only if bat is installed)
-if type -q bat
+# Overriding $MANPAGER is opinionated (C3 overrides)
+if type -q bat; and __fish_config_op_enabled __fish_config_op_overrides
     set -gx MANROFFOPT -c
     set -gx MANPAGER "sh -c 'col -bx | bat -l man -p'"
 end
@@ -40,38 +41,46 @@ set -gx __done_notification_urgency_level low
 
 ## Functions
 # Functions needed for !! and !$ https://github.com/oh-my-fish/plugin-bang-bang
-function __history_previous_command
-    switch (commandline -t)
-        case "!"
-            commandline -t $history[1]
-            commandline -f repaint
-        case "*"
-            commandline -i !
+# The bang-bang system is opinionated (C3 overrides) and is gated atomically
+# here, in conf.d/abbr.fish, conf.d/puffer.fish, and functions/expand_*.fish.
+if __fish_config_op_enabled __fish_config_op_overrides
+    function __history_previous_command
+        switch (commandline -t)
+            case "!"
+                commandline -t $history[1]
+                commandline -f repaint
+            case "*"
+                commandline -i !
+        end
     end
-end
 
-function __history_previous_command_arguments
-    switch (commandline -t)
-        case "!"
-            commandline -t ""
-            commandline -f history-token-search-backward
-        case "*"
-            commandline -i '$'
+    function __history_previous_command_arguments
+        switch (commandline -t)
+            case "!"
+                commandline -t ""
+                commandline -f history-token-search-backward
+            case "*"
+                commandline -i '$'
+        end
     end
-end
 
-# Apply bang-bang key bindings based on current key binding mode
-if [ "$fish_key_bindings" = fish_vi_key_bindings ]
-    bind -Minsert ! __history_previous_command
-    bind -Minsert '$' __history_previous_command_arguments
-else
-    bind ! __history_previous_command
-    bind '$' __history_previous_command_arguments
+    # Apply bang-bang key bindings based on current key binding mode
+    if [ "$fish_key_bindings" = fish_vi_key_bindings ]
+        bind -Minsert ! __history_previous_command
+        bind -Minsert '$' __history_previous_command_arguments
+    else
+        bind ! __history_previous_command
+        bind '$' __history_previous_command_arguments
+    end
 end
 
 # Fish command history override to show timestamps
-function history
-    builtin history --show-time='%F %T '
+# Shadowing the history command is opinionated (C1 aliasing); when disabled,
+# the function is never defined and fish's stock history behavior applies.
+if __fish_config_op_enabled __fish_config_op_aliases
+    function history
+        builtin history --show-time='%F %T '
+    end
 end
 
 # Quick file backup utility
@@ -97,21 +106,26 @@ alias ....='cd ../../..'
 alias .....='cd ../../../..'
 alias ......='cd ../../../../..'
 
-# Tools & Core command color overrides
-alias dir='dir --color=auto'
-alias vdir='vdir --color=auto'
-alias grep='grep --color=auto'
-alias fgrep='fgrep --color=auto'
-alias egrep='egrep --color=auto'
+# Silent flag injection into POSIX tools is opinionated (C1 aliasing)
+if __fish_config_op_enabled __fish_config_op_aliases
+    # Tools & Core command color overrides
+    alias dir='dir --color=auto'
+    alias vdir='vdir --color=auto'
+    alias grep='grep --color=auto'
+    alias fgrep='fgrep --color=auto'
+    alias egrep='egrep --color=auto'
 
-# Safety aliases (Confirmation before overwriting/deleting)
-alias cp="cp -i"
-alias mv="mv -i"
+    # Safety aliases (Confirmation before overwriting/deleting)
+    alias cp="cp -i"
+    alias mv="mv -i"
+
+    # Force wget to resume partial downloads
+    alias wget='wget -c '
+end
 
 # Archives and networking short-hands
 alias tarnow='tar -acf '
 alias untar='tar -zxvf '
-alias wget='wget -c '
 alias tb='nc termbin.com 9999'
 
 # System Logs