fix(agent): derive activity stages from tool actions

tests/routes/chatActivityTracker.test.ts

@@ -1,8 +1,72 @@
 import { describe, expect, it } from "bun:test";
 
 import { createActivityTracker } from "../../src/routes/chatActivityTracker.js";
+import { initialActivity } from "../../src/routes/chatStreamEvents.js";
 
 describe("createActivityTracker", () => {
+  it("moves real tool work out of preparation when the model omits activity updates", () => {
+    const events: Array<{ event: string; data: Record<string, unknown> }> = [];
+    const tracker = createActivityTracker({
+      clientSessionId: "client-session-1",
+      write: (event, data) => events.push({ event, data }),
+    });
+    const action = (id: string, tool: string, status: string) =>
+      tracker.upsertAction(
+        { id, tool, state: { status, input: {} } } as never,
+        {},
+      );
+
+    tracker.start(initialActivity.id, initialActivity.title, initialActivity.reason);
+    action("skill-1", "skill", "completed");
+    action("read-1", "read", "completed");
+    action("data-1", "tjwater_cli", "completed");
+    action("data-1", "tjwater_cli", "completed");
+    action("compute-1", "bash", "completed");
+    action("map-1", "show_chart", "completed");
+    tracker.finalize("completed");
+
+    const started = events
+      .filter(({ data }) =>
+        (data.activity as { actions: unknown[] }).actions.length === 0 &&
+        (data.activity as { status: string }).status === "running",
+      )
+      .map(({ data }) => (data.activity as { title: string }).title);
+    expect(started).toEqual([
+      initialActivity.title,
+      "查找所需资料",
+      "获取业务数据",
+      "处理分析数据",
+      "更新地图与图表",
+    ]);
+    expect(tracker.getActionContext("read-1")?.title).toBe("查找所需资料");
+    expect(tracker.getActionContext("data-1")?.title).toBe("获取业务数据");
+    expect(tracker.getActionContext("map-1")?.title).toBe("更新地图与图表");
+  });
+
+  it("keeps a model-provided stage across tool categories", () => {
+    const events: Array<{ event: string; data: Record<string, unknown> }> = [];
+    const tracker = createActivityTracker({
+      clientSessionId: "client-session-1",
+      write: (event, data) => events.push({ event, data }),
+    });
+    tracker.start(initialActivity.id, initialActivity.title, initialActivity.reason);
+    tracker.start("model-stage", "验证分析结果", "核对本次计算与数据。");
+    for (const [id, tool] of [["tool-1", "tjwater_cli"], ["tool-2", "show_chart"]]) {
+      tracker.upsertAction(
+        { id, tool, state: { status: "completed", input: {} } } as never,
+        {},
+      );
+    }
+    expect(tracker.getActionContext("tool-1")?.title).toBe("验证分析结果");
+    expect(tracker.getActionContext("tool-2")?.title).toBe("验证分析结果");
+    expect(
+      events.filter(({ data }) =>
+        (data.activity as { actions: unknown[] }).actions.length === 0 &&
+        (data.activity as { status: string }).status === "running",
+      ),
+    ).toHaveLength(2);
+  });
+
   it("groups actions and closes running children with their activity", () => {
     const events: Array<{ event: string; data: Record<string, unknown> }> = [];
     const tracker = createActivityTracker({