重构 Agent 聊天，支持分支管理与消息克隆

src/lib/chatStream.test.ts

@@ -1,4 +1,4 @@
-import { streamAgentChat } from "./chatStream";
+import { abortAgentChat, forkAgentChat, streamAgentChat } from "./chatStream";
 import { ReadableStream } from "stream/web";
 import { TextEncoder, TextDecoder } from "util";
 
@@ -147,4 +147,49 @@ describe("streamAgentChat", () => {
       { type: "error", message: "network request failed", detail: "Failed to fetch" },
     ]);
   });
+
+  it("calls abort endpoint for an active session", async () => {
+    apiFetch.mockResolvedValue({
+      ok: true,
+      status: 202,
+      text: async () => "",
+    });
+
+    await abortAgentChat("s1");
+
+    expect(apiFetch).toHaveBeenCalledWith(
+      expect.stringContaining("/api/v1/agent/chat/abort"),
+      expect.objectContaining({
+        method: "POST",
+        projectHeaderMode: "include",
+        skipAuthRedirect: true,
+        body: JSON.stringify({
+          session_id: "s1",
+        }),
+      }),
+    );
+  });
+
+  it("calls fork endpoint and returns new session id", async () => {
+    apiFetch.mockResolvedValue({
+      ok: true,
+      status: 200,
+      json: async () => ({ session_id: "forked-s1" }),
+      text: async () => "",
+    });
+
+    const sessionId = await forkAgentChat("s1", 3);
+
+    expect(sessionId).toBe("forked-s1");
+    expect(apiFetch).toHaveBeenCalledWith(
+      expect.stringContaining("/api/v1/agent/chat/fork"),
+      expect.objectContaining({
+        method: "POST",
+        body: JSON.stringify({
+          session_id: "s1",
+          keep_message_count: 3,
+        }),
+      }),
+    );
+  });
 });