fix(agent): stabilize decision support grounding

tests/test_generate.py

@@ -12,6 +12,7 @@ from agent.generate import (
     UNCERTAIN_MESSAGE,
     answer_question,
     build_user_content,
+    ensure_decision_support_conflict,
     looks_like_refusal,
     strip_think,
     trim_results,
@@ -61,6 +62,20 @@ class TestDecisionSupportValidation:
     )
     allowed = ["wk-akt-04", "lb-sva-03"]
 
+    def test_appends_fully_omitted_retrieved_conflict(self):
+        answer = ensure_decision_support_conflict(
+            self.question, "Die Prämie ist lohnsteuerfrei [wk-akt-04].", self.allowed
+        )
+        assert "⚠ Quellenkonflikt" in answer
+        assert "[lb-sva-03] ordnet" in answer
+        assert validate_decision_support_answer(self.question, answer, self.allowed) == []
+
+    def test_does_not_mask_existing_conflict_attempt(self):
+        original = "⚠ Widerspruch: Beide Quellen [wk-akt-04] [lb-sva-03]."
+        assert ensure_decision_support_conflict(
+            self.question, original, self.allowed
+        ) == original
+
     def test_requires_conflict_when_both_sources_are_in_context(self):
         violations = validate_decision_support_answer(
             self.question, "Nur lohnsteuerfrei [wk-akt-04].", self.allowed
@@ -74,6 +89,13 @@ class TestDecisionSupportValidation:
         )
         assert validate_decision_support_answer(self.question, answer, self.allowed) == []
 
+    def test_accepts_equivalent_listet_wording(self):
+        answer = (
+            "⚠ [wk-akt-04] nennt die Prämie SV- und BV-pflichtig. "
+            "[lb-sva-03] listet sie im Katalog als beitragsfreien Bezug."
+        )
+        assert validate_decision_support_answer(self.question, answer, self.allowed) == []
+
     def test_rejects_reversed_source_roles_and_prompt_leakage(self):
         answer = (
             "⚠ [wk-akt-04] und [lb-sva-03] ordnen die Prämie als beitragsfrei "