answering my own question for future reference (but still incomplete).

This is all for the new terminal which is a lot nicer than the old one.

After deplaning we headed towards baggage claim and signs saying Pasajeros transitos. Where you go down the stairs/escalators to baggage claim/passport control/exit, you only go half way down the stairs on the left of the escalators (well-marked "Pasajeros Transitos") and into a small area with a booth and security screening. They direct you to the booth but not sure why. If you have a "Transit" card, you go directly to the screening. I didn't but they didn't seem to check at the screening. The sign directs "Pasajeros Transitos" to the booth so that's where I went then rejoined the security screening line (at the end). Things seemed to be moving ok, perhaps 2-3 minutes to get to the booth and another 4-5 to get through security screen at about 4 PM on a Friday so about 15 minutes max from deplaning to getting to my gate and my boarding passes.

You come out of the booth/screen area near Gate 9 which is where the Star Alliance lounge is. I went searching for a transit desk which I never found. I ran across AC's gate first and asked if they could print my boarding passes (I had checked in online). They obliged so I didn't search anymore and went back to Star lounge (1 floor above the gate area via elevator near gate 9).