style(app-server): rustfmt external_agents.rs

preflight --check flagged one match arm in needs_update from 2a315afc48.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

crates/app-server/src/runtime_api/external_agents.rs

@@ -317,7 +317,10 @@ fn parsed_version(text: &str) -> Option<semver::Version> {
 }
 
 fn needs_update(version: Option<&str>, minimum: Option<&str>) -> bool {
-    match (version.and_then(parsed_version), minimum.and_then(parsed_version)) {
+    match (
+        version.and_then(parsed_version),
+        minimum.and_then(parsed_version),
+    ) {
         (Some(found), Some(floor)) => found < floor,
         _ => false,
     }