Continue GC code review and cleanup

tests/providers/test_openrouter.py

@@ -120,6 +120,7 @@ class TestOpenRouterProviderTranscribe:
 
         assert result.text == "Line 1\nLine 2"
         assert result.provider == "openrouter"
+        assert result.prompt_name is None
         assert result.model == "vendor/model-b"
         assert result.ai_metadata == {
             "finish_reason": "stop",
@@ -142,6 +143,27 @@ class TestOpenRouterProviderTranscribe:
                 mime_type="image/png",
             )
 
+    @pytest.mark.asyncio
+    async def test_sends_pdf_as_file_content(self):
+        """PDF payloads use OpenRouter's file content contract."""
+        response = {"model": "vendor/model-a", "choices": [{"message": {"content": "Transcript text"}}]}
+        client = _FakeClient(response=response)
+        provider = OpenRouterTranscriptionProvider(
+            settings=Settings(openrouter_api_key="test-key"),
+            client=client,
+        )
+
+        await provider.transcribe(
+            prompt_text="Prompt body",
+            image_bytes=b"pdf-bytes",
+            mime_type="application/pdf",
+        )
+
+        content = client.chat.calls[0]["messages"][0]["content"]
+        assert content[1]["type"] == "file"
+        assert content[1]["file"]["filename"] == "source.pdf"
+        assert content[1]["file"]["file_data"].startswith("data:application/pdf;base64,")
+
     @pytest.mark.asyncio
     async def test_raises_on_empty_or_invalid_response(self):
         """Transcribe raises ProviderResponseError for missing completion text."""