docs: define three-project issue planning order (#1)

tests/test_harness_docs.py

@@ -115,6 +115,24 @@ class TaskTemplateTests(unittest.TestCase):
             errors,
         )
 
+    def test_task_template_requires_coordination_fields(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            template = root / ".gitea" / "issue_template" / "task.md"
+            template.parent.mkdir(parents=True)
+            template.write_text("## 基本信息\n", encoding="utf-8")
+            errors: list[str] = []
+            check_task_template(errors, root)
+        self.assertIn(
+            "单元任务模板缺少：- 任务类型：单项目 / 协同",
+            errors,
+        )
+        self.assertIn("单元任务模板缺少：- 主 agent：", errors)
+        self.assertIn("单元任务模板缺少：## 协同接口", errors)
+        self.assertIn("单元任务模板缺少：- 生产者：", errors)
+        self.assertIn("单元任务模板缺少：- 消费者：", errors)
+        self.assertIn("单元任务模板缺少：- write_paths：", errors)
+
     def test_task_template_requires_dependency_fields(self) -> None:
         with tempfile.TemporaryDirectory() as directory:
             root = Path(directory)