Q1) Yes, Pass shows values. The delayed entry into the auction is a bit strange but I would still treat the responder pass the same.
Q1A) To Pass interference in a 2
♣ auction to show "values" I would think it requires anything you would NOT consider to be in the
double-nagative category. This hand with a K and J barely qualifies as "values".
Q2) Since
♥'s were not bid previously, the Kokish 3
♥ shows a "single suited" hand with
♥'s, and, it should set trumps (does it? have you made this agreement?). I would think anything above that is a control bid by East. But, he went straight to game. So, even though partner's previous pass showed "values" greater than a double-negative, it's time to back off. Partner initially told us he had values and has further defined his hand (saying "I have nothing more") with the 4
♥ bid.
Never argue with an idiot. They will only bring you down to their level and beat you with experience. George Carlin