feat(fish-deps): add uv as managed dep; install before cargo and fish

uv is now listed first in the catalog (before cargo and fish) so it is
installed automatically before the fish source build is attempted.
Install uses the official curl script; update uses `uv self update`.

Catalog order is now: uv → cargo → fish → … ensuring prerequisites are
in place before any dependent install method runs.

README updated: uv and cargo added to the Required table, warning callout
and dependency management note reflect the automatic install flow.

functions/_fish_deps_catalog.fish

@@ -11,32 +11,32 @@
 #   _fdc_pm      — system PM package name, or "" if not in repos
 #   _fdc_special — special install key: rustup-installer | fisher-bootstrap |
 #                  fzf-update | paru-build | pipx | curl-installer |
-#                  git-cargo-fish | "" (none)
+#                  git-cargo-fish | curl-uv | "" (none)
 #
-# cargo is listed second so it is installed before Rust tools that depend on it.
+# uv and cargo are listed first so both are available before fish and other Rust tools.
 function _fish_deps_catalog
     set -g _fdc_bins \
-        fish cargo fisher starship fzf zoxide direnv paru \
+        uv cargo fish fisher starship fzf zoxide direnv paru \
         wakatime tailscale \
         eza lsd bat btop dust duf prettyping most rg lazygit lazydocker trash kitty wezterm
 
     set -g _fdc_tiers \
-        req req req req req req req rec \
+        req req req req req req req req rec \
         int int \
         rec rec rec rec rec rec rec rec rec rec rec rec rec rec
 
     set -g _fdc_cargo \
-        "" "" "" starship "" zoxide "" "" \
+        "" "" "" "" starship "" zoxide "" "" \
         "" "" \
         eza lsd bat "" du-dust "" "" "" ripgrep "" "" trashy "" ""
 
     set -g _fdc_pm \
-        fish cargo "" starship fzf zoxide direnv "" \
+        uv cargo 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 \
-        git-cargo-fish rustup-installer fisher-bootstrap curl-installer fzf-update "" "" paru-build \
+        curl-uv rustup-installer git-cargo-fish fisher-bootstrap curl-installer fzf-update "" "" paru-build \
         wakatime-binary "" \
         "" "" "" "" "" "" "" "" "" "" curl-lazydocker "" "" ""
 end

functions/_fish_deps_install.fish

@@ -47,6 +47,9 @@ function _fish_deps_install
 
             # Preferred special methods — listed before system PM so they are the default
             switch $special
+                case curl-uv
+                    set -a methods special-uv
+                    set -a method_labels "curl installer (official script)"
                 case git-cargo-fish
                     if type -q cargo; and type -q uv
                         set -a methods special-git-cargo-fish
@@ -206,6 +209,20 @@ function _fish_deps_install
                     and makepkg -si --noconfirm
                     and popd
                     rm -rf $_build_dir
+                case special-uv
+                    curl -LsSf https://astral.sh/uv/install.sh | sh
+                    # Add uv to PATH for the rest of this session
+                    for _d in "$HOME/.local/bin" "$HOME/.cargo/bin"
+                        if test -d "$_d"
+                            fish_add_path "$_d"
+                            break
+                        end
+                    end
+                    if not type -q uv
+                        set_color yellow
+                        echo "  uv not yet in PATH — restart your shell if subsequent installs fail."
+                        set_color normal
+                    end
                 case special-git-cargo-fish
                     set -l _tmpdir (mktemp -d)
                     set -l _build_ok 0

functions/_fish_deps_update.fish

@@ -93,6 +93,15 @@ function _fish_deps_update
             continue
         end
 
+        # uv: use built-in self-updater
+        if test "$special" = curl-uv
+            echo "Updating $bin..."
+            uv self update
+            set updated_any 1
+            set i (math $i + 1)
+            continue
+        end
+
         # fish: prefer build from source via git + cargo; fall back to PM
         if test "$special" = git-cargo-fish
             if type -q cargo; and type -q uv