Okay... I'm dumb. In my earlier post on RTA's Google Transit offerings, I falsely stated that CommuterLink routes were not included. I neglected to notice that I was testing the system on a weekend. You know, when CommuterLink doesn't run. Now that it's Monday, all 200-series routes are showing up in Google Transit properly and as scheduled.
We still don't have the bus stop locations showing on the map, but the trip planner functionality seems complete. Go RTA!