test: complete retry boundary runtime lifecycle fixture

Give the no-op retry service runtime its required read-only lifecycle accessor. Preserve all singleflight, authority and shutdown assertions; keep production lifecycle checks strict.

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

server/src/__tests__/chat-failed-run-retry-boundary.test.ts

@@ -14,7 +14,7 @@ function createService(db: Db) {
   const runtimeShutdown = vi.fn().mockResolvedValue(undefined);
   const service = chatChannelService(db, {
     heartbeat: { wakeup },
-    runtime: { shutdown: runtimeShutdown } as unknown as ChatChannelServiceOptions["runtime"],
+    runtime: { shutdown: runtimeShutdown, hasUnsettledLifecycle: () => false } as unknown as ChatChannelServiceOptions["runtime"],
   });
   services.add(service);
   return { service, wakeup, runtimeShutdown };