feat: add agent cost reporting

hub/test/integration/trigger.test.ts

@@ -73,6 +73,7 @@ function createMockRunAgent(calls: RunRequest[] = []): TestRunner {
       status: "completed",
       text: "mock response",
       usage: { inputTokens: 10, outputTokens: 5 },
+      costUsd: 0.0023,
       numTurns: 1,
       sdkSessionId: "sdk-session-1",
     };
@@ -128,7 +129,7 @@ describe("trigger full lifecycle (integration)", () => {
       msgType: "interactive",
       replyInThread: undefined,
     });
-    expect(rt.sentTexts).toContain("mock response");
+    expect(rt.sentTexts.some((text) => text.includes("mock response") && text.includes("本次成本: $0.0023"))).toBe(true);
     expect(runAgentCalls).toHaveLength(1);
     expect(runAgentCalls[0]?.providerEnv).toMatchObject({
       ANTHROPIC_BASE_URL: "https://openrouter.ai/api",
@@ -136,6 +137,9 @@ describe("trigger full lifecycle (integration)", () => {
       ANTHROPIC_API_KEY: "",
     });
     expect(runAgentCalls[0]?.maxTurns).toBe(7);
+    const run = await prisma.agentRun.findFirstOrThrow();
+    expect(Number(run.costUsd)).toBeCloseTo(0.0023);
+    expect(run.costSource).toBe("provider_reported");
   });
 
   it("batches quick text messages from the same chat and sender into one run", async () => {
@@ -228,6 +232,65 @@ describe("trigger full lifecycle (integration)", () => {
     expect(await prisma.agentRun.findMany()).toHaveLength(0);
   });
 
+  it("/cost reports recorded current-session cost without creating a run", async () => {
+    await seedProject("proj-cost", "chat-cost");
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-cost", "@_user_1 写教案"), rt);
+    await vi.waitFor(async () => {
+      const runs = await prisma.agentRun.findMany();
+      expect(runs).toHaveLength(1);
+      expect(runs[0]?.status).toBe("COMPLETED");
+    });
+
+    await trigger(makeEvent("chat-cost", "@_user_1 /cost"), rt);
+
+    const costText = rt.sentTexts.at(-1) ?? "";
+    expect(costText).toContain("当前会话已记录 agent 成本");
+    expect(costText).toContain("总计: $0.0023");
+    expect(costText).toContain("Runs: 1 已记录");
+    expect(costText).toContain("openrouter / mock-model");
+    expect(runAgentCalls).toHaveLength(1);
+    expect(await prisma.agentRun.findMany()).toHaveLength(1);
+  });
+
+  it("/cost surfaces finished runs without recorded cost", async () => {
+    await seedProject("proj-cost-missing", "chat-cost-missing");
+    const session = await prisma.agentSession.create({
+      data: {
+        projectId: "proj-cost-missing",
+        provider: "openrouter",
+        roleId: "draft",
+        model: "mock-model",
+        metadata: {},
+      },
+      select: { id: true },
+    });
+    await prisma.agentRun.create({
+      data: {
+        projectId: "proj-cost-missing",
+        sessionId: session.id,
+        entrypoint: "FEISHU",
+        status: "COMPLETED",
+        prompt: "old test run",
+        model: "mock-model",
+        provider: "openrouter",
+        inputTokens: 10,
+        outputTokens: 5,
+        metadata: {},
+        finishedAt: new Date(),
+      },
+    });
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-cost-missing", "@_user_1 /cost"), rt);
+
+    const costText = rt.sentTexts.at(-1) ?? "";
+    expect(costText).toContain("还没有任何 run 记录到真实成本");
+    expect(costText).toContain("未记录成本: 1 runs");
+    expect(runAgentCalls).toHaveLength(0);
+  });
+
   it("/help is built from the current registry on each request", async () => {
     await seedProject("proj-help-live", "chat-help-live");
     let currentModels = new InMemoryModelRegistry(