Preserve runner process start time across controller recovery

Use the verified remote process marker and adopted process identity when reporting runner process metadata, rather than the creation time of a replacement controller transport.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/services/native-runtime/native-session-executor.ts

@@ -6362,7 +6362,11 @@ export function createRemoteRunnerProcessLauncher(input: {
         };
       }
     })();
-    return { child, completion };
+    return {
+      child,
+      completion,
+      get startedAt() { return launchedIdentity?.startedAt; },
+    };
   };
 }