Add support for ScheduleWakeup and other Cron* tasks

[cboos]

ScheduleWakeup message example

{
  "parentUuid": "8a1c8fbb-b636-4c7d-a24b-953a2852619a",
  "isSidechain": false,
  "message": {
    "model": "claude-opus-4-7",
    "id": "msg_01LiEYhj6Hwg6jcoMSbdx6ni",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_01Q4rSkqkkKjnqbHKqP1Gt7M",
        "name": "ScheduleWakeup",
        "input": {
          "delaySeconds": 240,
          "reason": "First parent loop tick at +4min — by then (...)"
        },
        "caller": {
          "type": "direct"
        }
      }
    ],
    "stop_reason": "tool_use",
    "stop_sequence": null,
    "stop_details": null,
    "usage": {
      "input_tokens": 1,
      "cache_creation_input_tokens": 157,
      "cache_read_input_tokens": 105721,
      "...",
      "speed": "standard"
    }
  },
  "requestId": "req_011Cak6isXUTj1afT5aZFtR5",
  "type": "assistant",
  "uuid": "2514ea31-9c9f-4487-8bc1-ec8ed38b9284",
  "timestamp": "2026-05-05T21:03:53.150Z",
  "userType": "external",
  "entrypoint": "cli",
  "cwd": ".../claude-code-log/experiments/loop",
  "sessionId": "6d1760b6-5a8d-4693-b6ee-f4e27e427e88",
  "version": "2.1.128",
  "gitBranch": "HEAD"
}