feat(config): accept STRIX_REASONING_EFFORT=max for providers that support it (#956)

Co-authored-by: Ahmed Allam <allam@usestrix.com>

tests/test_inputs.py

@@ -129,6 +129,17 @@ def test_prompt_cache_kept_for_non_bedrock_claude_even_if_unmapped(monkeypatch:
         ]
 
 
+def test_max_reasoning_effort_sent_as_raw_body_field() -> None:
+    # "max" is absent from the OpenAI SDK's Reasoning enum, and LiteLLM's DeepSeek
+    # mapping collapses every effort to thinking-enabled, so it has to ride along
+    # as a raw body field to reach the provider.
+    settings = make_model_settings(
+        "max", model_name="deepseek/deepseek-v4-flash", request_timeout=30
+    )
+    assert settings.reasoning is None
+    assert settings.extra_args == {"timeout": 30, "extra_body": {"reasoning_effort": "max"}}
+
+
 def test_conversation_tail_breakpoint_moves_with_appended_transcript() -> None:
     # LiteLLM must place the index=-1 cache_control on the last message however
     # long the transcript grows.