feat: OllamaClient.identify_speakers() and summarize() for diarization pipeline

tests/test_llm.py

@@ -35,3 +35,47 @@ async def test_list_models_returns_list():
         client = OllamaClient(base_url="http://localhost:11434")
         models = await client.list_models()
         assert "gemma3:12b" in models
+
+
+@pytest.mark.asyncio
+async def test_identify_speakers_returns_dict():
+    import respx, httpx, json
+    from llm import OllamaClient
+    client = OllamaClient()
+    mapping = {"SPEAKER_00": "Thomas", "SPEAKER_01": "Möller"}
+    transcript_excerpt = "SPEAKER_00: Gut, Herr Möller.\nSPEAKER_01: Danke, Thomas."
+
+    with respx.mock:
+        respx.post("http://localhost:11434/api/generate").mock(
+            return_value=httpx.Response(200, json={"response": json.dumps(mapping)})
+        )
+        result = await client.identify_speakers(transcript_excerpt)
+    assert result == {"SPEAKER_00": "Thomas", "SPEAKER_01": "Möller"}
+
+
+@pytest.mark.asyncio
+async def test_identify_speakers_returns_empty_on_parse_failure():
+    import respx, httpx
+    from llm import OllamaClient
+    client = OllamaClient()
+
+    with respx.mock:
+        respx.post("http://localhost:11434/api/generate").mock(
+            return_value=httpx.Response(200, json={"response": "kein json hier"})
+        )
+        result = await client.identify_speakers("irgendwas")
+    assert result == {}
+
+
+@pytest.mark.asyncio
+async def test_summarize_returns_string():
+    import respx, httpx
+    from llm import OllamaClient
+    client = OllamaClient()
+
+    with respx.mock:
+        respx.post("http://localhost:11434/api/generate").mock(
+            return_value=httpx.Response(200, json={"response": "# Zusammenfassung\n\nKurzer Text."})
+        )
+        result = await client.summarize("Thomas: Hallo.\nMöller: Hi.", model="gemma3:12b")
+    assert "Zusammenfassung" in result