refactor(agent): reduce loop runner parameter plumbing

tests/agent/test_runner_progress_deltas.py

@@ -17,39 +17,6 @@ from nanobot.providers.base import LLMResponse, ToolCallRequest
 _MAX_TOOL_RESULT_CHARS = AgentDefaults().max_tool_result_chars
 
 
-@pytest.mark.asyncio
-async def test_runner_can_disable_provider_progress_delta_streaming():
-    """AgentLoop disables token progress streaming for non-streaming channels."""
-    provider = MagicMock()
-    provider.supports_progress_deltas = True
-    provider.chat_with_retry = AsyncMock(
-        return_value=LLMResponse(content="done", tool_calls=[], usage=None)
-    )
-    provider.chat_stream_with_retry = AsyncMock()
-    tools = MagicMock()
-    tools.get_definitions.return_value = []
-    progress_cb = AsyncMock()
-
-    runner = AgentRunner()
-    result = await runner.run(make_run_spec(provider,
-        initial_messages=[
-            {"role": "system", "content": "system"},
-            {"role": "user", "content": "hi"},
-        ],
-        tools=tools,
-        model="test-model",
-        max_iterations=1,
-        max_tool_result_chars=_MAX_TOOL_RESULT_CHARS,
-        progress_callback=progress_cb,
-        stream_progress_deltas=False,
-    ))
-
-    assert result.final_content == "done"
-    provider.chat_with_retry.assert_awaited_once()
-    provider.chat_stream_with_retry.assert_not_awaited()
-    progress_cb.assert_not_awaited()
-
-
 @pytest.mark.asyncio
 async def test_runner_streams_provider_progress_deltas_by_default():
     """Direct runner users keep the existing opt-in provider progress behavior."""