feat(agent): budget reminders, usage while waiting, budget-exceeded status and dedupe

- tool results carry a budget reminder near limits; text before the last tool
  call is dropped as report when cut by budget/abort
- usage persisted when a run suspends, so waiting sessions show spent tokens
- task page shows budget_exceeded via business.outcome instead of completed
- budget-exceeded decisions merge by root cause (decision / schedule / goal
  template); new summaries added to investigate allowlist

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/tasks/labels.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it } from "vitest";
+import { engineRunStatus } from "./labels.ts";
+
+describe("任务行状态", () => {
+  const agent = (outcome: string | null) => ({
+    kind: "agent" as const,
+    refId: "r1",
+    title: null,
+    triggeredBy: null,
+    outcome,
+  });
+  it("引擎跑完但 Agent 会话超出预算 / 失败:显示业务结果,不显示「完成」", () => {
+    expect(engineRunStatus({ status: "completed", business: agent("budget_exceeded") })).toEqual({
+      label: "超出预算",
+      tone: "warning",
+    });
+    expect(engineRunStatus({ status: "completed", business: agent("failed") }).label).toBe("失败");
+    expect(engineRunStatus({ status: "completed", business: agent("succeeded") }).label).toBe("完成");
+  });
+  it("引擎自身失败 / 进行中照旧;没有业务对象照旧", () => {
+    expect(engineRunStatus({ status: "failed", business: agent("budget_exceeded") }).label).toBe("失败");
+    expect(engineRunStatus({ status: "running", business: agent("running") }).label).toBe("进行中");
+    expect(engineRunStatus({ status: "completed", business: null }).label).toBe("完成");
+  });
+});