Oh nice. I didn't know this because I haven't ran fedimint software myself.
Can the lightning gateway rug without signing a transaction?
Gateway can't rug at all
Also as a user, how easy is it to find the signed transaction your mint is making if you wanted to see that?
Not super easy as a user. There is an audit log that you can get that gives you every event in the mint. You can find the onchain txs there and see who signed the txs