Thanks for your response. I hadn’t known what crabasa shared in that post, but that’s not what I was looking for.
I feel ridiculous: I eventually realized that the server-side console.log statements were outputting to my Git Bash terminal where I ran yarn rw dev. I don’t know how I didn’t notice them before. That’s what I was looking for. My question was probably too basic for you to know what I was asking. 
And I finally bailed on explicit joiner tables (# 2 from First steps after tutorial), and it feels good to have at least the implicit version working.
I love seeing all of your posts… so positive and helpful!