fix(feishu): honor blockStreamingDefault config instead of hardcoding disable

Feishu was hardcoding disableBlockStreaming: true, ignoring the user's
agents.defaults.blockStreamingDefault setting. Now respects the config:

- blockStreamingDefault: "on" -> disableBlockStreaming: false
- blockStreamingDefault: "off" or unset -> disableBlockStreaming: true

Fixes #51117.

extensions/feishu/src/reply-dispatcher.test.ts

@@ -604,6 +604,28 @@ describe("createFeishuReplyDispatcher streaming behavior", () => {
     expect(streamingInstances).toHaveLength(1);
   });
 
+  it("respects blockStreamingDefault: on from agents config", async () => {
+    const result = createFeishuReplyDispatcher({
+      cfg: { agents: { defaults: { blockStreamingDefault: "on" } } } as never,
+      agentId: "agent",
+      runtime: createRuntimeLogger(),
+      chatId: "oc_chat",
+    });
+
+    expect(result.replyOptions.disableBlockStreaming).toBe(false);
+  });
+
+  it("disables block streaming by default when blockStreamingDefault is not set", async () => {
+    const result = createFeishuReplyDispatcher({
+      cfg: { agents: { defaults: {} } } as never,
+      agentId: "agent",
+      runtime: createRuntimeLogger(),
+      chatId: "oc_chat",
+    });
+
+    expect(result.replyOptions.disableBlockStreaming).toBe(true);
+  });
+
   it("passes replyToMessageId and replyInThread to streaming.start()", async () => {
     const { options } = createDispatcherHarness({
       runtime: createRuntimeLogger(),

extensions/feishu/src/reply-dispatcher.ts

@@ -479,7 +479,7 @@ export function createFeishuReplyDispatcher(params: CreateFeishuReplyDispatcherP
     replyOptions: {
       ...replyOptions,
       onModelSelected: prefixContext.onModelSelected,
-      disableBlockStreaming: true,
+      disableBlockStreaming: cfg.agents?.defaults?.blockStreamingDefault !== "on",
       onPartialReply: streamingEnabled
         ? (payload: ReplyPayload) => {
             if (!payload.text) {