feat(scouts): real triage LLM call via scout-triage-system prompt

tests/test_scout_engine.py

@@ -172,6 +172,59 @@ async def test_idempotent_replay(monkeypatch):
     assert len(rows) == 1, "Replay must not create duplicate queue rows"
 
 
+@pytest.mark.asyncio
+async def test_triage_llm_parses_json_response(monkeypatch):
+    """Real _triage_llm path: mock the LLM ainvoke, verify TriageVerdict parsed correctly."""
+    from unittest.mock import MagicMock  # noqa: PLC0415
+
+    from app.models import CloudScoutConfig  # noqa: PLC0415
+
+    scout = CloudScoutConfig(
+        id=str(uuid.uuid4()),
+        user_id="00000000-0000-0000-0000-000000000003",
+        provider="gmail",
+        name="test-scout",
+        data_types=[],
+        prompt_template="watch invoices and project updates",
+        schedule_cron="0 * * * *",
+        enabled=True,
+        auto_trash_spam=False,
+        device_inactivity_pause_days=14,
+    )
+    content = ItemContent(
+        metadata=ItemMetadata(subject="Invoice 42", sender="billing@acme.com"),
+        body_text="Payment of €1 200 is due on 2026-06-01. Please confirm receipt.",
+    )
+
+    # Build a fake LangChain response whose .content is valid JSON.
+    fake_response = MagicMock()
+    fake_response.content = '{"verdict": "relevant", "reason": "invoice due", "confidence": 0.92}'
+    fake_response.usage_metadata = {"input_tokens": 10, "output_tokens": 5, "total_tokens": 15}
+
+    # Fake LLM: .bind() returns self (or another mock with ainvoke).
+    fake_llm = MagicMock()
+    fake_llm.bind.return_value = fake_llm
+    fake_llm.ainvoke = AsyncMock(return_value=fake_response)
+
+    # Patch get_llm inside app.scouts.engine so our fake is used.
+    monkeypatch.setattr("app.scouts.engine.get_llm", lambda **kwargs: fake_llm)
+    # Disable Langfuse for this test.
+    monkeypatch.setattr("app.scouts.engine.get_langfuse", lambda: None)
+    # Use fallback prompt (no Langfuse) — patch get_prompt_or_fallback to return fallback.
+    monkeypatch.setattr(
+        "app.scouts.engine.get_prompt_or_fallback",
+        lambda name, fallback: (fallback, None),
+    )
+
+    engine = ScoutEngine(session_factory=_TestSessionLocal)
+    verdict = await engine._triage_llm(scout, content)
+
+    assert verdict.verdict == "relevant"
+    assert verdict.reason == "invoice due"
+    assert abs(verdict.confidence - 0.92) < 1e-6
+    fake_llm.ainvoke.assert_awaited_once()
+
+
 @pytest.mark.asyncio
 async def test_deliver_pending_sends_one_frame_per_queued_row(monkeypatch):
     user_id = "00000000-0000-0000-0000-000000000003"