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]>

packages/agent/src/pi/fake.ts

@@ -202,8 +202,10 @@ function toolResults(messages: Message[]): FakeToolResult[] {
     if (m.role !== "toolResult") continue;
     const text = messageText(m);
     let json: unknown;
+    // 第一块文本是能力输出;运行时可能在后面追加【预算提醒】等附注块
+    const first = (m.content as Array<{ type: string; text?: string }>).find((c) => c.type === "text")?.text ?? text;
     try {
-      json = JSON.parse(text);
+      json = JSON.parse(first);
     } catch {
       json = undefined;
     }