fix(deps): remove paru install, enforce cargo preference for Rust tools

Catalog: clear paru's pm and special install entries so it appears in
status but fish-deps install skips it (it's a package manager, not a
managed dep).

Install: cargo is now always attempted first for Rust tools. When cargo
is absent but a crate exists, a note is printed suggesting rustup.
When only one method is available the chosen method is shown so the user
can see whether cargo or the system PM is being used. Method prompt now
shows the default label inline for clarity.

Removed dead paru-build switch case from the install executor.

functions/_fish_deps_catalog.fish

@@ -10,7 +10,7 @@
 #   _fdc_cargo   — cargo crate name, or "" if not on crates.io
 #   _fdc_pm      — system PM package name, or "" if not in repos
 #   _fdc_special — special install key: fisher-bootstrap | fzf-update |
-#                  paru-build | pipx | curl-installer | "" (none)
+#                  pipx | curl-installer | "" (none)
 function _fish_deps_catalog
     set -g _fdc_bins \
         fish fisher starship fzf zoxide direnv paru \
@@ -28,12 +28,12 @@ function _fish_deps_catalog
         eza lsd bat "" du-dust "" "" "" ripgrep "" "" trash-cli "" ""
 
     set -g _fdc_pm \
-        fish "" starship fzf zoxide direnv paru \
+        fish "" starship fzf zoxide direnv "" \
         wakatime tailscale \
         eza lsd bat btop dust duf prettyping most ripgrep lazygit lazydocker trash kitty wezterm
 
     set -g _fdc_special \
-        "" fisher-bootstrap curl-installer fzf-update "" "" paru-build \
+        "" fisher-bootstrap curl-installer fzf-update "" "" "" \
         pipx "" \
         "" "" "" "" "" "" "" "" "" "" "" "" "" ""
 end

functions/_fish_deps_install.fish

@@ -20,13 +20,19 @@ function _fish_deps_install
             set -l methods
             set -l method_labels
 
-            # Cargo — only if cargo is present and the tool has a crate
-            if test -n "$cargo_crate"; and type -q cargo
+            # Cargo first — preferred for Rust tools; gets the latest crate version
+            if test -n "$cargo_crate"
+                if type -q cargo
                     set -a methods cargo
                     set -a method_labels "cargo ($cargo_crate)"
+                else
+                    set_color brblack
+                    echo "  note: cargo not found — install rustup for the latest $bin"
+                    set_color normal
+                end
             end
 
-            # System PM — only if a PM is detected and the tool is in repos
+            # System PM — after cargo so cargo is always the default when available
             if test -n "$pm_pkg"; and test -n "$pm"
                 set -a methods pm
                 set -a method_labels "$pm ($pm_pkg)"
@@ -43,15 +49,6 @@ function _fish_deps_install
                 case curl-installer
                     set -a methods special-curl
                     set -a method_labels "curl installer"
-                case paru-build
-                    if type -q yay
-                        set -a methods special-yay-paru
-                        set -a method_labels "yay -S paru"
-                    end
-                    if type -q pacman
-                        set -a methods special-paru
-                        set -a method_labels "build from AUR (makepkg)"
-                    end
                 case pipx
                     if type -q pipx
                         set -a methods special-pipx
@@ -83,13 +80,16 @@ function _fish_deps_install
                 echo "  Available methods:"
                 set -l m 1
                 for lbl in $method_labels
-                    echo "    $m) $lbl"
+                    set_color brblack; echo -n "    $m) "; set_color normal
+                    echo $lbl
                     set m (math $m + 1)
                 end
-                read -l -P "  Choose [1-"(count $methods)"] (default 1): " _choice
+                read -l -P "  Choose [1-"(count $methods)"] (default 1 = $method_labels[1]): " _choice
                 if test -n "$_choice"; and test "$_choice" -ge 1; and test "$_choice" -le (count $methods)
                     set chosen_method $methods[$_choice]
                 end
+            else
+                set_color brblack; echo "  Installing via $method_labels[1]"; set_color normal
             end
 
             # Execute chosen method
@@ -107,15 +107,6 @@ function _fish_deps_install
                     if test "$bin" = starship
                         curl -sS https://starship.rs/install.sh | sh
                     end
-                case special-yay-paru
-                    yay -S --noconfirm paru
-                case special-paru
-                    set -l _build_dir (mktemp -d)
-                    git clone https://aur.archlinux.org/paru.git $_build_dir
-                    and pushd $_build_dir
-                    and makepkg -si --noconfirm
-                    and popd
-                    rm -rf $_build_dir
                 case special-pipx
                     pipx install $bin
                 case special-pip