Watch folders that run a chain on drop

A lot of my file work is the same chain over and over: photos off the phone to WebP at deck size, recordings to normalised audio. Today each run means opening Hangar and dragging. A good outcome is assigning a chain to a folder. Anything that lands in that folder runs through the chain and lands in a destination folder, logged like any other run. It is the hands-off version of chains, and it fits the local-first pitch because the watcher runs on my machine.