nushell: replace ssh wrapper with ghostty +ssh

Replace the inline ssh integration with a thin wrapper that translates
GHOSTTY_SHELL_FEATURES into a `ghostty +ssh` command line. When no
ssh-* feature is enabled, the wrapper falls through to the real `ssh`
binary unchanged so nushell users without ssh integration get plain
ssh behavior.

src/shell-integration/nushell/vendor/autoload/ghostty.nu

@@ -4,79 +4,23 @@ export module ghostty {
     $feature in ($env.GHOSTTY_SHELL_FEATURES | default "" | split row ',')
   }
 
-  # Wrap `ssh` with Ghostty TERMINFO support
+  # Wrap `ssh` with `ghostty +ssh` and translate the shell-integration
+  # feature flags into command options.
   export def --wrapped ssh [...args] {
-    mut ssh_env = {}
-    mut ssh_opts = []
-
-    # `ssh-env`: use xterm-256color and propagate COLORTERM/TERM_PROGRAM vars
-    if (has_feature "ssh-env") {
-      $ssh_env.TERM = "xterm-256color"
-      $ssh_env.COLORTERM = "truecolor"
-      $ssh_opts = [
-        "-o" "SendEnv COLORTERM TERM_PROGRAM TERM_PROGRAM_VERSION"
-      ]
+    if not ((has_feature "ssh-env") or (has_feature "ssh-terminfo")) {
+      ^ssh ...$args
+      return
     }
 
-    # `ssh-terminfo`: auto-install xterm-ghostty terminfo on remote hosts
-    if (has_feature "ssh-terminfo") {
-      let ghostty = ($env.GHOSTTY_BIN_DIR? | default "") | path join "ghostty"
-
-      let ssh_cfg = ^ssh -G ...$args
-        | lines
-        | parse "{key} {value}"
-        | where key in ["user" "hostname"]
-        | select key value
-        | transpose -rd
-        | default {user: $env.USER hostname: "localhost"}
-      let ssh_id = $"($ssh_cfg.user)@($ssh_cfg.hostname)"
-
-      if (^$ghostty "+ssh-cache" $"--host=($ssh_id)" | complete | $in.exit_code == 0) {
-        $ssh_env.TERM = "xterm-ghostty"
-      } else {
-        $ssh_env.TERM = "xterm-256color"
-
-        let terminfo = try {
-          ^infocmp -0 -x xterm-ghostty
-        } catch {
-          print -e "infocmp failed, using xterm-256color"
-        }
-
-        if ($terminfo | is-not-empty) {
-          print $"Setting up xterm-ghostty terminfo on ($ssh_cfg.hostname)..."
-
-          let ctrl_path = (
-            mktemp -td $"ghostty-ssh-($ssh_cfg.user).XXXXXX"
-            | path join "socket"
-          )
-
-          let remote_args = $ssh_opts ++ [
-            "-o" "ControlMaster=yes"
-            "-o" $"ControlPath=($ctrl_path)"
-            "-o" "ControlPersist=60s"
-          ] ++ $args
-
-          $terminfo | ^ssh ...$remote_args '
-            infocmp xterm-ghostty >/dev/null 2>&1 && exit 0
-            command -v tic >/dev/null 2>&1 || exit 1
-            mkdir -p ~/.terminfo 2>/dev/null && tic -x - 2>/dev/null && exit 0
-            exit 1'
-          | complete
-          | if $in.exit_code == 0 {
-            ^$ghostty "+ssh-cache" $"--add=($ssh_id)" e>| print -e
-            $ssh_env.TERM = "xterm-ghostty"
-            $ssh_opts = ($ssh_opts ++ ["-o" $"ControlPath=($ctrl_path)"])
-          } else {
-            print -e "terminfo install failed, using xterm-256color"
-          }
-        }
-      }
+    let ghostty = ($env.GHOSTTY_BIN_DIR? | default "") | path join "ghostty"
+    mut flags = []
+    if not (has_feature "ssh-env") {
+      $flags = ($flags ++ ["--forward-env=false"])
     }
-
-    let ssh_args = $ssh_opts ++ $args
-    with-env $ssh_env {
-      ^ssh ...$ssh_args
+    if not (has_feature "ssh-terminfo") {
+      $flags = ($flags ++ ["--terminfo=false"])
     }
+    ^$ghostty "+ssh" ...$flags "--" ...$args
   }
 
   # Wrap `sudo` to preserve Ghostty's TERMINFO environment variable