You are the victim of a husband and wife hustle. They are tag teaming you, in an attempt to con you. Don't fall for it.
An above board husband would have simply told his wife " No hunny that wasnt included in the discussion I had with the contractor ".
End of discussion, you never know it happened.
They are trying to create confusion to get free work out of you.
As someone else said, the husband is your client, deal with him only. The scope of work was discussed by the two of you only.
Its not uncommon for verbal discussions to be referred to and observed by both the homeowner and the contractor. Its rare that every last detail is spelled out in the written
contract, not should it need to be.
At least that’s your speculation, they could just be crazy and not have had any ill intent or conspiracy cooked up.