feat: 不用斜杠，单发 goal 也触发 /goal 目标

触发词从仅 /goal 放宽到 /goal 或裸 goal（大小写不敏感，
单数 only，goals/mygoal 不算）：goal 收xxx、goal，目标是
收xxx、发goal 收xxx 均同款触发，新建与主线转换入口共用
同一解析。讨论句式仍不触发：goal 的用法、goal 是什么、
讨论goal的用法、/goal的用法 均返回 None。
单测补 4 项：裸 goal 触发、裸 goal 讨论不触发、followup
裸 goal 转换、新建裸 goal。

cloud/tests/test_mainline_goal_command.py

@@ -56,6 +56,22 @@ class ParserTestCase(unittest.TestCase):
         self.assertIsNone(parse_goal_command("请帮我完成目标收xxx"))
         self.assertIsNone(parse_goal_command("hello world"))
 
+    def test_bare_goal_without_slash(self):
+        # 不用斜杠：用户单发 goal 也触发同款目标。
+        self.assertEqual(parse_goal_command("goal 收xxx"), "收xxx")
+        self.assertEqual(parse_goal_command("goal，目标是收xxx"), "收xxx")
+        self.assertEqual(parse_goal_command("goal目标是收xxx"), "收xxx")
+        self.assertEqual(parse_goal_command("goal收xxx"), "收xxx")
+        self.assertEqual(parse_goal_command("发goal 收xxx"), "收xxx")
+        self.assertEqual(parse_goal_command("goal"), "")
+
+    def test_bare_goal_discussion_still_not_a_command(self):
+        self.assertIsNone(parse_goal_command("goal的用法"))
+        self.assertIsNone(parse_goal_command("goal是什么意思"))
+        self.assertIsNone(parse_goal_command("讨论goal的用法"))
+        self.assertIsNone(parse_goal_command("请问goal是什么意思"))
+        self.assertIsNone(parse_goal_command("/goal的用法"))
+
 
 class ServerTestCase(unittest.TestCase):
     def setUp(self):
@@ -248,6 +264,20 @@ class ServerTestCase(unittest.TestCase):
         task = self._create(prompt="讨论/goal的用法")
         self.assertEqual(task["goal_mode"], 0)
 
+    def test_followup_bare_goal_converts(self):
+        task = self._create()
+        status, body = self._req(
+            "POST", "/tasks/%s/followups" % task["id"],
+            {"body": "goal 收xxx"}, self.owner_key)
+        self.assertEqual(status, 200, body)
+        self.assertEqual(body["delivery"], "goal_converted")
+        self.assertEqual(body["goal"], "收xxx")
+
+    def test_create_task_bare_goal(self):
+        task = self._create(prompt="goal 收xxx")
+        self.assertEqual(task["goal_mode"], 1)
+        self.assertEqual(task["goal"], "收xxx")
+
     def test_continue_goal_command(self):
         task = self._create()
         self._set_status(task["id"], "completed")