Spark's back ... troubleshot all the components, found no signal coming from the pickup coil on the RH side of the engine. Pulled the cover, found that the nut holding on the ignition trigger collar had backed off. The trigger collar was no longer engaged with the locating pin on the crank end, so while the crank was spinning when I thumbed the starter, the trigger flag on the collar wasn't passing the pickup to send a "spark!" signal
So I Reassembled, torqued the nut, and viola! spark!
I'm going to chalk this up under WTF and move on. I've put 10,000+ flawless miles on this bike over the last couple years, and right after I clean up the bike and take the craigslist photos, the nut mysteriously backs off. Maybe she's not ready to go!