refactor: remove name from WorkflowDefinition, fix threadId type errors

WorkflowDefinition no longer carries 'name' — name is a registry-level
concern, not a bundle property. Also fixed all missing threadId in test
fixtures to match the updated ThreadContext type.

小橘 <xiaoju@shazhou.work>

packages/workflow-agent-llm/__tests__/create-llm-adapter.test.ts

@@ -11,7 +11,8 @@ function makeCtx(userContent: string): ThreadContext {
       meta: { maxRounds: 10 },
       timestamp: 1,
     },
-    steps: [],
+      steps: [],
+      threadId: "01TEST000000000000000000TR",
   };
 }