Enforce Zhuyuan persona-source epistemic gate

skills/codex/guanghu-persona-skill-guard/scripts/test_compile_collective_cognition.py

@@ -1,3 +1,4 @@
+import copy
 import unittest
 
 from compile_collective_cognition import (
@@ -44,6 +45,14 @@ class CollectiveCognitionCompilerTests(unittest.TestCase):
         with self.assertRaises(ValueError):
             compile_graph([{**contribution, "nodes": cyclic_nodes}])
 
+    def test_duplicate_contribution_stable_number_fails_closed(self):
+        contribution = load_contributions()[0]
+        duplicate = copy.deepcopy(contribution)
+        stable_number = "-".join(contribution["contribution_id"].split("-")[:3])
+        duplicate["contribution_id"] = f"{stable_number}-ANOTHER-CHAIN"
+        with self.assertRaisesRegex(ValueError, "duplicate contribution stable number"):
+            compile_graph([contribution, duplicate])
+
 
 if __name__ == "__main__":
     unittest.main()