More digits on cost (#364)

paperqa/agents/tools.py

@@ -39,7 +39,7 @@ def status(self) -> str:
             f"Status: Paper Count={len(self.docs.docs)} | Relevant Papers="
             f"{len({c.text.doc.dockey for c in self.answer.contexts if c.score > self.RELEVANT_SCORE_CUTOFF})}"
             f" | Current Evidence={len([c for c in self.answer.contexts if c.score > self.RELEVANT_SCORE_CUTOFF])}"
-            f" | Current Cost=${self.answer.cost:.2f}"
+            f" | Current Cost=${self.answer.cost:.4f}"
         )