Question: Pierce asked Cap if Fury told Cap that Fury was the one who bugged it, but what did Fury bug?
Question: Why is Ronan able to hold the Infinity Stone? Isn't he a mortal like Peter?
Answer: As a Kree, he has superior physical and mental strength that allows him to briefly hold the Infinity Stone, just as Peter held it briefly. But if he had held it longer he would have been destroyed, although he would be able to hold it longer than most. This is why he was trying to embed the stone into his Cosmi-Rod.
Chosen answer: They were talking about the apartment Steve Rogers lives in. Pierce is saying Nick Fury bugged Cap's apartment, one of his own agents.
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