Removed extra model defaults sprinkled throughout the repo

src/paperqa/agents/helpers.py

@@ -26,9 +26,9 @@ def get_year(ts: datetime | None = None) -> str:
 
 async def litellm_get_search_query(
     question: str,
+    llm: LLMModel | str,
     count: int,
     template: str | None = None,
-    llm: LLMModel | str = "gpt-4o-mini",
     temperature: float = 1.0,
 ) -> list[str]:
     search_prompt = ""

src/paperqa/agents/models.py

@@ -66,7 +66,7 @@ def strip_answer(
         v.filter_content_for_user()
         return v
 
-    async def get_summary(self, llm_model: LLMModel | str = "gpt-4o") -> str:
+    async def get_summary(self, llm_model: LLMModel | str) -> str:
         sys_prompt = (
             "Revise the answer to a question to be a concise SMS message. "
             "Use abbreviations or emojis if necessary."