fix: allow custom provider to configure thinking style (#4429)

nanobot/providers/factory.py

@@ -54,7 +54,7 @@ def _make_provider_core(
     if provider_name and not spec and p:
         if not p.api_base:
             raise ValueError(f"Provider '{provider_name}' requires api_base in config.")
-        spec = create_dynamic_spec(provider_name)
+        spec = create_dynamic_spec(provider_name, thinking_style=p.thinking_style if p else "")
     if spec and spec.is_transcription_only:
         raise ValueError(f"Provider '{provider_name}' only supports transcription.")
     backend = spec.backend if spec else "openai_compat"

nanobot/providers/registry.py

@@ -628,7 +628,7 @@ def find_by_name(name: str) -> ProviderSpec | None:
     return None
 
 
-def create_dynamic_spec(name: str) -> ProviderSpec:
+def create_dynamic_spec(name: str, *, thinking_style: str = "") -> ProviderSpec:
     """Create a dynamic ProviderSpec for custom user-defined providers."""
     normalized = to_snake(name.replace("-", "_"))
     strip_prefixes = tuple(dict.fromkeys((name, normalized)))
@@ -640,4 +640,5 @@ def create_dynamic_spec(name: str) -> ProviderSpec:
         backend="openai_compat",
         is_direct=True,
         strip_model_prefixes=strip_prefixes,
+        thinking_style=thinking_style,
     )