Give the ssh tests one bare host instead of two copies

Two tests built the same HostConfig inline -- a name, an address, and
nothing else configured. It is now `bare_host()`, named for what it is
about: the case that proves this adds no flags of its own when it was not
told to.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017xn8nHw1tw1R6PtiY1eEtw

server/src/ssh.rs

@@ -129,6 +129,19 @@ mod tests {
             .collect()
     }
 
+    /// A host with nothing configured but a name to dial, so `~/.ssh/config`
+    /// decides everything else -- the case that proves this adds no flags of
+    /// its own when it was not told to.
+    fn bare_host() -> HostConfig {
+        HostConfig {
+            name: "vm".to_string(),
+            address: "vm".to_string(),
+            port: None,
+            identity_file: None,
+            options: vec![],
+        }
+    }
+
     #[test]
     fn a_session_with_no_host_runs_the_command_directly() {
         let command = command(
@@ -177,13 +190,7 @@ mod tests {
 
     #[test]
     fn a_remote_command_without_a_cwd_just_execs() {
-        let ssh = HostConfig {
-            name: "vm".to_string(),
-            address: "vm".to_string(),
-            port: None,
-            identity_file: None,
-            options: vec![],
-        };
+        let ssh = bare_host();
         let rendered = argv(&command(Some(&ssh), "claude", &args(["-p"]), None));
         assert_eq!(rendered.last().unwrap(), "exec 'claude' '-p'");
         // No -i means no IdentitiesOnly: ~/.ssh/config decides instead.
@@ -200,13 +207,7 @@ mod tests {
 
         // The end-to-end version of the same worry: a working directory
         // that tries to close the quote and start a new command.
-        let ssh = HostConfig {
-            name: "vm".to_string(),
-            address: "vm".to_string(),
-            port: None,
-            identity_file: None,
-            options: vec![],
-        };
+        let ssh = bare_host();
         let evil = Path::new("/tmp/'; touch /tmp/pwned; '");
         let rendered = argv(&command(Some(&ssh), "claude", &[], Some(evil)));
         let script = rendered.last().unwrap();