I fortuitously learned that sidenote, which went belly-up in Lion and was still dead in the water in Yosemite, has come back to life in El Cap.
And now that I've upgraded to El Cap I've discovered that Timer Utility, which suffered the exact same fate, has come back to life, too.
This having happened once was nice, but its having happened twice in a very small population (2 out of 2 in my case) seems to indicate that Apple has reversed something they did in OS X 10.7 - 10.10, so I suggest that anybody who's got some dead, beloved old (Intel) apps squirreled away dust them off and give them a run in El Cap; you may be as pleasantly surprised as I was.
(The resurrection of my two apps, which more than offsets the loss of my PPC apps, has made the transition to El Cap more bearable.)
