Add read-only production runtime audit

apps/ai-service/tests/test_grounded_generation.py

@@ -7,6 +7,7 @@ from the real METFORMIN and PARACETAMOL sections in `duocthu_v1`.
 from __future__ import annotations
 
 import json
+from dataclasses import replace
 
 import pytest
 
@@ -516,6 +517,43 @@ def test_a_real_negative_verdict_is_still_an_unsupported_claim():
     assert metrics.total(GENERATION_REJECTED, reason="request_budget_exhausted") == 0
 
 
+def test_patient_candidate_list_retries_one_noisy_entailment_rejection():
+    metrics = InMemoryMetrics()
+    result = _result()
+    result = replace(
+        result,
+        evidence=(replace(result.evidence[0], drug_id="metformin"),),
+    )
+    generator = _Generator(
+        [
+            {"claims": [{"drug_id": "metformin", "text": "Người lớn uống 500 mg", "citations": [1]}],
+             "evidence_sufficient": True},
+            {"claims": [{"drug_id": "metformin", "text": "Người lớn uống 500 mg", "citations": [1]}],
+             "evidence_sufficient": True},
+        ],
+        entailment_payload=[
+            {"entailed": False, "unsupported": [1]},
+            {"entailed": True, "unsupported": [], "complete": True},
+        ],
+    )
+    service = GroundedAnswerService(_FixedRouting(result), generator, metrics)
+
+    grounded = service.answer_from_result(
+        "Trong các thuốc trên thuốc nào cần lưu ý hơn với bệnh thận?",
+        result,
+        list_mode=True,
+        patient_specific=True,
+        candidate_drug_ids=("metformin",),
+        prechecked=True,
+    )
+
+    assert grounded.generated is True
+    assert grounded.result.decision == EvidenceDecision.ANSWERABLE
+    assert generator._call == 2
+    assert generator._entailment_call == 2
+    assert metrics.total(GENERATION_REJECTED, reason="unsupported_claim") == 0
+
+
 def test_entailment_check_is_skipped_when_there_are_no_claims():
     """No claims at all (2026-08-10: the structured-claims schema makes a
     claim's `text` a required, non-empty field, so the old "answer is