fix: support AI commands in media captions

tests/test_ai_command.py

@@ -167,6 +167,7 @@ class AgentContextTests(unittest.IsolatedAsyncioTestCase):
             chat=SimpleNamespace(id=99),
             from_user=SimpleNamespace(id=42),
             reply_to_message=None,
+            photo=SimpleNamespace(file_size=100),
         )
         account = SimpleNamespace(
             me=SimpleNamespace(id=7, full_name="Owner", username="owner"),
@@ -184,6 +185,7 @@ class AgentContextTests(unittest.IsolatedAsyncioTestCase):
         )
         agent = MagicMock()
         agent.create_session.return_value = session
+        attached_media = MagicMock()
 
         with (
             patch("app.agentic.OpenAIBasedLLM") as llm_class,
@@ -191,6 +193,10 @@ class AgentContextTests(unittest.IsolatedAsyncioTestCase):
             patch("app.agentic.BraveSearchTools") as brave_tools,
             patch("app.agentic.WebPageTools") as web_page_tools,
             patch("app.agentic._build_context_messages", AsyncMock(return_value=[])),
+            patch(
+                "app.agentic._download_message_media",
+                AsyncMock(return_value=[attached_media]),
+            ),
         ):
             brave_tools.return_value.tools.return_value = []
             web_page_tools.return_value.tools.return_value = []
@@ -210,6 +216,7 @@ class AgentContextTests(unittest.IsolatedAsyncioTestCase):
             model="ds-model",
         )
         self.assertTrue(aggregator_class.call_args.kwargs["thinking"])
+        session.run.assert_awaited_once_with("prompt", media=[attached_media])
         brave_tools.assert_called_once_with(api_key="brave-key", timeout_seconds=10.0)
         web_page_tools.assert_called_once_with(timeout_seconds=45.0, max_chars=60_000)
         result.handle.close()