Windows 10: What is "JD_TaskSchedulerSchedule"?

Yep, it's Trillian. I think it was trying and failing to set a scheduled task for itself. Weirdly, it'll still do it after Trillian's uninstalled. Had to reset my install to get it to go away.

 

For future reference you can use NirSoft's TaskSchedulerView to search all task data as a single monolithic database. The problem with Microsoft's implementation is that they force you to do it on a category-by-category basis. This is much faster and easier, should you ever find yourself in a similar boat again (I learned this because DriverUpdate would run a batch job at irregular intervals, and I found this annoying cmd.exe window popping up on my desktop from time to time).
HTH,
--Ed--