feat(fish-deps): add win32yank installer for WSL2

New optional-tier catalog entry, gated on WSL2 detection
(/proc/sys/kernel/osrelease) so it never surfaces on a plain Linux
box's install/sync prompts, only in the informational status
listing. Downloads the x86_64 binary from GitHub releases to
~/.local/bin/win32yank.exe; fish-deps update refreshes an
already-installed copy the same way.

functions/_fish_deps_catalog.fish

@@ -36,27 +36,27 @@ function _fish_deps_catalog
     set -g _fdc_bins \
         uv cargo fish starship fzf zoxide direnv paru yay \
         wakatime tailscale \
-        eza lsd bat btop dust duf prettyping go ov rg lazygit lazydocker docker trash kitty wezterm python3 yt-dlp screen mpv vlc marktext firejail
+        eza lsd bat btop dust duf prettyping go ov rg lazygit lazydocker docker trash kitty wezterm python3 yt-dlp screen mpv vlc marktext firejail win32yank.exe
 
     set -g _fdc_tiers \
         rec rec req rec req rec rec rec rec \
         int int \
-        rec rec rec opt opt opt opt opt rec rec opt opt opt rec term term rec opt opt opt opt opt opt
+        rec rec rec opt opt opt opt opt rec rec opt opt opt rec term term rec opt opt opt opt opt opt opt
 
     set -g _fdc_cargo \
         "" "" "" starship "" zoxide "" "" "" \
         "" "" \
-        eza lsd bat "" du-dust "" "" "" "" ripgrep "" "" "" trashy "" "" "" "" "" "" "" "" ""
+        eza lsd bat "" du-dust "" "" "" "" ripgrep "" "" "" trashy "" "" "" "" "" "" "" "" "" ""
 
     set -g _fdc_pm \
         uv cargo fish starship fzf zoxide direnv "" yay \
         wakatime tailscale \
-        eza lsd bat btop dust duf prettyping go ov ripgrep lazygit lazydocker docker trash kitty wezterm python yt-dlp screen mpv vlc "" firejail
+        eza lsd bat btop dust duf prettyping go ov ripgrep lazygit lazydocker docker trash kitty wezterm python yt-dlp screen mpv vlc "" firejail ""
 
     set -g _fdc_special \
         curl-uv rustup-installer git-cargo-fish curl-installer fzf-update "" "" paru-build yay-build \
         wakatime-binary "" \
-        "" "" "" "" "" "" "" "" go-ov "" "" curl-lazydocker "" "" "" "" "" "" "" "" "" marktext-release ""
+        "" "" "" "" "" "" "" "" go-ov "" "" curl-lazydocker "" "" "" "" "" "" "" "" "" marktext-release "" win32yank-release
 end
 
 # SYNOPSIS

functions/_fish_deps_install.fish

@@ -46,6 +46,14 @@ function _fish_deps_install
 
     set -l i 1
     for bin in $_fdc_bins
+        # win32yank only matters under WSL2 — skip the entry entirely
+        # elsewhere so a plain Linux box never sees it, not even as a
+        # "no install method available" note.
+        if test "$bin" = win32yank.exe; and not string match -qi '*microsoft*' (cat /proc/sys/kernel/osrelease 2>/dev/null)
+            set i (math $i + 1)
+            continue
+        end
+
         # Optional-tier deps are opt-in: skip unless --optional/--all was passed.
         if test "$_fdc_tiers[$i]" = opt; and test $include_optional -eq 0
             if not command -q $bin
@@ -140,6 +148,15 @@ function _fish_deps_install
                     end
                     set -a methods special-marktext-appimage
                     set -a method_labels "AppImage download (~/.local/bin/marktext)"
+                case win32yank-release
+                    if test (uname -m) = x86_64
+                        set -a methods special-win32yank
+                        set -a method_labels "binary download (github releases)"
+                    else
+                        set_color brblack
+                        echo "  note: win32yank only ships x86_64 builds (this is "(uname -m)")"
+                        set_color normal
+                    end
                 case go-ov
                     if type -q go
                         set -a methods special-go-ov
@@ -296,6 +313,18 @@ function _fish_deps_install
                     and chmod +x "$_wt_bin"
                     and ln -sf "$_wt_bin" "$HOME/.local/bin/wakatime"
                     rm -rf "$_tmpdir"
+                case special-win32yank
+                    set -l _zip win32yank-x64.zip
+                    set -l _tmpdir (mktemp -d)
+                    mkdir -p "$HOME/.local/bin"
+                    and curl -fL "https://github.com/equalsraf/win32yank/releases/latest/download/$_zip" \
+                        -o "$_tmpdir/$_zip"
+                    and unzip -o "$_tmpdir/$_zip" -d "$_tmpdir"
+                    and cp "$_tmpdir/win32yank.exe" "$HOME/.local/bin/win32yank.exe"
+                    and chmod +x "$HOME/.local/bin/win32yank.exe"
+                    set -l _dl_status $status
+                    rm -rf "$_tmpdir"
+                    test $_dl_status -eq 0
                 case special-fzf
                     fzf-update
                 case special-curl

functions/_fish_deps_update.fish

@@ -146,6 +146,25 @@ function _fish_deps_update
             continue
         end
 
+        # win32yank: re-download the binary from github releases (WSL2 only;
+        # only reached if a copy is already on PATH, so no WSL check needed)
+        if test "$special" = win32yank-release
+            echo "Updating $bin..."
+            set -l _zip win32yank-x64.zip
+            set -l _tmpdir (mktemp -d)
+            curl -fL "https://github.com/equalsraf/win32yank/releases/latest/download/$_zip" \
+                -o "$_tmpdir/$_zip"
+            and unzip -o "$_tmpdir/$_zip" -d "$_tmpdir"
+            and cp "$_tmpdir/win32yank.exe" "$HOME/.local/bin/win32yank.exe"
+            and chmod +x "$HOME/.local/bin/win32yank.exe"
+            set -l _up_status $status
+            rm -rf "$_tmpdir"
+            test $_up_status -eq 0
+            and set updated_any 1
+            set i (math $i + 1)
+            continue
+        end
+
         # pipx tools
         if test "$special" = pipx
             if type -q pipx