fix: remove stale model_size kwarg from CLI create_timmy() calls

The model_size parameter was removed from create_timmy() but three CLI
commands (think, chat, status) still passed it, causing TypeError crashes.

Fixes #604

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/timmy/cli.py

@@ -139,7 +139,7 @@ def think(
     model_size: str | None = _MODEL_SIZE_OPTION,
 ):
     """Ask Timmy to think carefully about a topic."""
-    timmy = create_timmy(backend=backend, model_size=model_size, session_id=_CLI_SESSION_ID)
+    timmy = create_timmy(backend=backend, session_id=_CLI_SESSION_ID)
     timmy.print_response(f"Think carefully about: {topic}", stream=True, session_id=_CLI_SESSION_ID)
 
 
@@ -202,7 +202,7 @@ def chat(
         session_id = str(uuid.uuid4())
     else:
         session_id = _CLI_SESSION_ID
-    timmy = create_timmy(backend=backend, model_size=model_size, session_id=session_id)
+    timmy = create_timmy(backend=backend, session_id=session_id)
 
     # Use agent.run() so we can intercept paused runs for tool confirmation.
     run_output = timmy.run(message_str, stream=False, session_id=session_id)
@@ -279,7 +279,7 @@ def status(
     model_size: str | None = _MODEL_SIZE_OPTION,
 ):
     """Print Timmy's operational status."""
-    timmy = create_timmy(backend=backend, model_size=model_size, session_id=_CLI_SESSION_ID)
+    timmy = create_timmy(backend=backend, session_id=_CLI_SESSION_ID)
     timmy.print_response(STATUS_PROMPT, stream=False, session_id=_CLI_SESSION_ID)
 
 

tests/timmy/test_cli.py

@@ -55,14 +55,14 @@ def test_think_sends_topic_to_agent():
     )
 
 
-def test_think_passes_model_size_option():
+def test_think_ignores_model_size_option():
-    """think --model-size 70b must forward the model size to create_timmy."""
+    """think --model-size is accepted but not forwarded to create_timmy."""
     mock_timmy = MagicMock()
 
     with patch("timmy.cli.create_timmy", return_value=mock_timmy) as mock_create:
         runner.invoke(app, ["think", "topic", "--model-size", "70b"])
 
-    mock_create.assert_called_once_with(backend=None, model_size="70b", session_id="cli")
+    mock_create.assert_called_once_with(backend=None, session_id="cli")
 
 
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