任务内标记工具：task-create/task-poll/task-read 移植、wait-threads 接通、新增 task-cancel/task-retry

- 新模块 cloud/marker_tools.py：纯逻辑解析、校验、快照格式化、
  控制门禁、派生代数与直接上限计数
- sandbox 两处解析提取五种标记块；worker 在 5 处投递点与
  _deliver_peer_messages 同款位置执行，报告排成后续消息下一轮回父任务
- wait 每块 cap 到 8 个目标（与服务端 /wait 对齐，spawn 原先的 10 个收紧），
  每轮最多 2 块；取消/重试门禁：同项目、非自己、非 goal、
  派生链或同创建人，另查 create_task / approve_merge 权限，
  查不到时收紧到仅派生链内
- goal 与协调员任务不解析；单测 30 个，cloud 全量 1043 个、4 跳过、0 失败

cloud/sandbox.py

@@ -20,6 +20,11 @@ import shutil
 import subprocess
 import sys
 
+from cloud.marker_tools import extract_task_cancels as _extract_task_cancels
+from cloud.marker_tools import extract_task_creates as _extract_task_creates
+from cloud.marker_tools import extract_task_polls as _extract_task_polls
+from cloud.marker_tools import extract_task_retries as _extract_task_retries
+from cloud.marker_tools import extract_wait_threads as _extract_wait_threads
 from cloud.peer_messages import extract_peer_messages as _extract_peer_messages
 
 MAX_STDOUT_CHARS = 2000
@@ -280,6 +285,11 @@ class LocalExecutor(Executor):
         status = "failed"
         usage = None
         task_messages = []
+        task_creates = []
+        task_polls = []
+        wait_threads = []
+        task_cancels = []
+        task_retries = []
         turn_id = None
         root_turn_id = None
         if returncode == 0:
@@ -311,6 +321,13 @@ class LocalExecutor(Executor):
                 # 版 text 尾部的块会丢），worker 在 completed 轮次
                 # 后投递；goal 路径不走这里，goal 任务只收不发。
                 task_messages = _extract_peer_messages(parsed.get("text"))
+                # 标记工具块：与 task-message 同款从完整 text 里提取，
+                # worker 在 completed 轮次后执行；goal 路径不走这里。
+                task_creates = _extract_task_creates(parsed.get("text"))
+                task_polls = _extract_task_polls(parsed.get("text"))
+                wait_threads = _extract_wait_threads(parsed.get("text"))
+                task_cancels = _extract_task_cancels(parsed.get("text"))
+                task_retries = _extract_task_retries(parsed.get("text"))
             else:
                 host_status = None
         else:
@@ -328,6 +345,11 @@ class LocalExecutor(Executor):
             "stderr": _truncate_stdout(getattr(result, "stderr", "")),
             "usage": usage,
             "task_messages": task_messages,
+            "task_creates": task_creates,
+            "task_polls": task_polls,
+            "wait_threads": wait_threads,
+            "task_cancels": task_cancels,
+            "task_retries": task_retries,
             "turn_id": turn_id,
             "root_turn_id": root_turn_id,
         }
@@ -1570,6 +1592,11 @@ def _parse_host_result(task_id, fake):
     host_status = None
     usage = None
     task_messages = []
+    task_creates = []
+    task_polls = []
+    wait_threads = []
+    task_cancels = []
+    task_retries = []
     turn_id = None
     root_turn_id = None
     if returncode == 0:
@@ -1588,6 +1615,13 @@ def _parse_host_result(task_id, fake):
                       else "failed")
             usage = _clean_usage(parsed.get("usage"))
             task_messages = _extract_peer_messages(parsed.get("text"))
+            # 标记工具块：与 task-message 同款从完整 text 里提取，
+            # worker 在 completed 轮次后执行。
+            task_creates = _extract_task_creates(parsed.get("text"))
+            task_polls = _extract_task_polls(parsed.get("text"))
+            wait_threads = _extract_wait_threads(parsed.get("text"))
+            task_cancels = _extract_task_cancels(parsed.get("text"))
+            task_retries = _extract_task_retries(parsed.get("text"))
             # 任务列表显示 turn 用：与 Local 版同款语义，取不到
             # 时保持 None，worker 写回时不覆盖旧值。
             turn_id = parsed.get("turn_id")
@@ -1602,6 +1636,11 @@ def _parse_host_result(task_id, fake):
         "stderr": _truncate_stdout(getattr(fake, "stderr", "")),
         "usage": usage,
         "task_messages": task_messages,
+        "task_creates": task_creates,
+        "task_polls": task_polls,
+        "wait_threads": wait_threads,
+        "task_cancels": task_cancels,
+        "task_retries": task_retries,
         "turn_id": turn_id,
         "root_turn_id": root_turn_id,
     }