test(rust): pin the running-server handoff line whole

The existing assertions checked fragments ("doctor --game rust
--server-id alpha"), which the stray-space version also contained. The
whole first line is now compared, so a wrapped source line cannot put
its indent back into the sentence. Fails against the pre-fix literal.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

src/rustgame/sidecar.rs

@@ -265,6 +265,16 @@ mod tests {
             running.contains("doctor --game rust --server-id alpha"),
             "{running}"
         );
+        // The whole first line, so a wrapped source line cannot leave its indent in the sentence
+        // again (installer#34: "confirms it                  connected.").
+        assert_eq!(
+            running.lines().find(|l| !l.is_empty()),
+            Some(
+                "Rust server \"alpha\" is set up. The plugin loads now; \
+                 `doctor --game rust --server-id alpha` confirms it connected."
+            ),
+            "{running}"
+        );
     }
 
     #[test]