Here was the final outcome: Scheduling recognized the rest required and tried the SC assignment/rest combination CNO to me at a time I was non-contactable due to CQ. I didn't reply in any fashion. At midnight when I became contactable I received the live phone call beginning a 30 hr rest and canceling the previous short call assignment, as is required by the FAR.

This question still exists: Had I not received correct notification, how would I have theoretically been aware of an impending 117 violation to a SC that I wasn't legal for? I suppose there's multiple ways to skin the cat. My risk tolerance would be to let it ride until a few minutes prior to the SC start time, and then call scheduling to refuse the assignment for FARs and also prevent any entaglement defending myself to the FAA. A little brinksmanship to test the system. In the end, it worked out, and reinforces the need for us to keep a crosscheck and not do scheduling's work for them. On the live phone call, the scheduler sounded apologetic that they hadn't recognized the problem earlier and it was gratifying to have come to logical conclusion.