feat: 会话内 LLM 自判 goal / 自动化标记工具，不靠关键词

agent 在回合输出里写 goal-convert 块，worker 在轮次边界
排成 /goal 自后续消息、走已有 followup 转换路径把本会话
转成 goal；写 automation-create 块，worker 在轮次边界
创建自动化定义（权限 create_task、配额整轮门、创建人跟
父任务走、name 缺失自动生成、首次时刻已过去单块拒绝、
bind heartbeat 可绑回本会话）。

automations 新增 first_run_at / run_once：首次时刻只管
首次、之后按间隔算；只跑一次跑过后 is_due / due / claim
三处都不再到期（SQL 到期条件与 Python 口径共用同一
_DUE_SQL）；API 创建与更新同步接受这两个字段。

刻意不向 LLM 自动注入工具指南：避免 prompt 臃肿，格式
只写进 docs/marker-tools.md 与 README，需要时由用户在
会话里手动告诉 agent；服务端不按关键词再猜意图。

单测 cloud/tests/test_session_goal_automation.py 12 项，
相关回归 218 项全过。

cloud/sandbox.py

@@ -23,6 +23,10 @@ import sys
 import time
 
 from cloud.marker_tools import extract_quota_status as _extract_quota_status
+from cloud.marker_tools import extract_automation_creates as \
+    _extract_automation_creates
+from cloud.marker_tools import extract_goal_converts as \
+    _extract_goal_converts
 from cloud.marker_tools import extract_task_cancels as _extract_task_cancels
 from cloud.marker_tools import extract_task_costs as _extract_task_costs
 from cloud.marker_tools import extract_task_creates as _extract_task_creates
@@ -418,6 +422,8 @@ class LocalExecutor(Executor):
         todo_lists = []
         todo_creates = []
         todo_updates = []
+        goal_converts = []
+        automation_creates = []
         turn_id = None
         root_turn_id = None
         parsed = None
@@ -465,6 +471,9 @@ class LocalExecutor(Executor):
                 todo_lists = _extract_todo_lists(parsed.get("text"))
                 todo_creates = _extract_todo_creates(parsed.get("text"))
                 todo_updates = _extract_todo_updates(parsed.get("text"))
+                goal_converts = _extract_goal_converts(parsed.get("text"))
+                automation_creates = _extract_automation_creates(
+                    parsed.get("text"))
             else:
                 host_status = None
         else:
@@ -496,6 +505,8 @@ class LocalExecutor(Executor):
             "todo_lists": todo_lists,
             "todo_creates": todo_creates,
             "todo_updates": todo_updates,
+            "goal_converts": goal_converts,
+            "automation_creates": automation_creates,
             "turn_id": turn_id,
             "root_turn_id": root_turn_id,
         }
@@ -1944,6 +1955,8 @@ def _parse_host_result(task_id, fake):
     todo_lists = []
     todo_creates = []
     todo_updates = []
+    goal_converts = []
+    automation_creates = []
     turn_id = None
     root_turn_id = None
     parsed = None
@@ -1978,6 +1991,9 @@ def _parse_host_result(task_id, fake):
             todo_lists = _extract_todo_lists(parsed.get("text"))
             todo_creates = _extract_todo_creates(parsed.get("text"))
             todo_updates = _extract_todo_updates(parsed.get("text"))
+            goal_converts = _extract_goal_converts(parsed.get("text"))
+            automation_creates = _extract_automation_creates(
+                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")
@@ -2006,6 +2022,8 @@ def _parse_host_result(task_id, fake):
         "todo_lists": todo_lists,
         "todo_creates": todo_creates,
         "todo_updates": todo_updates,
+        "goal_converts": goal_converts,
+        "automation_creates": automation_creates,
         "turn_id": turn_id,
         "root_turn_id": root_turn_id,
     }