fix: auto-format backends and tests (#135)

src/timmy/backends.py

@@ -388,7 +388,9 @@ class GrokBackend:
 
     def _build_messages(self, message: str) -> list[dict[str, str]]:
         """Build the messages array for the API call."""
-        messages = [{"role": "system", "content": get_system_prompt(tools_enabled=True, session_id="grok")}]
+        messages = [
+            {"role": "system", "content": get_system_prompt(tools_enabled=True, session_id="grok")}
+        ]
         # Include conversation history for context
         messages.extend(self._history[-10:])
         messages.append({"role": "user", "content": message})

tests/timmy/test_backends.py

@@ -212,7 +212,7 @@ def test_airllm_prompt_contains_session_id():
 
     # Should contain the session_id, not the placeholder
     assert '{session_id}"' not in prompt
-    assert "session \"airllm\"" in prompt
+    assert 'session "airllm"' in prompt
 
 
 # ── ClaudeBackend ─────────────────────────────────────────────────────────