docs: freeze GoAdmin technical baseline (#5)

tests/test_harness_docs.py

@@ -17,6 +17,7 @@ from check_harness import (  # noqa: E402
     check_core_documents,
     check_agent_efficiency_rules,
     check_go_admin_ui_rules,
+    check_goadmin_baseline,
     check_task_template,
     core_mapping_errors,
     missing_sections,
@@ -213,6 +214,36 @@ class AgentRuleTests(unittest.TestCase):
         self.assertIn("缺少 go-admin 规则文件：Sense/AGENTS.md", errors)
         self.assertIn("缺少 go-admin 规则文件：Bell/AGENTS.md", errors)
 
+    def test_goadmin_baseline_is_frozen(self) -> None:
+        errors: list[str] = []
+        check_goadmin_baseline(errors)
+        self.assertEqual(errors, [])
+
+    def test_goadmin_baseline_rejects_unpinned_source(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            (root / "goadmin-baseline.json").write_text(
+                '{"authority":"tag","runtimes":{},'
+                '"sources":{"go-admin":{}},"rules":{}}',
+                encoding="utf-8",
+            )
+            errors: list[str] = []
+            check_goadmin_baseline(errors, root)
+        self.assertTrue(any("go-admin.commit" in error for error in errors))
+        self.assertIn(
+            "GoAdmin 技术基线必须以上游 URL 和 commit 为权威标识",
+            errors,
+        )
+
+    def test_goadmin_baseline_reports_missing_file(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            errors: list[str] = []
+            check_goadmin_baseline(errors, Path(directory))
+        self.assertEqual(
+            errors,
+            ["缺少 GoAdmin 技术基线：goadmin-baseline.json"],
+        )
+
     def test_claude_code_entry_requires_exact_import_line(self) -> None:
         with tempfile.TemporaryDirectory() as directory:
             root = Path(directory)