Put a folder on the watch list
Context
Put a folder on the watch list
Adds a folder to the watch list without ingesting anything. Idempotent by path: re-adding a folder already on the list turns watching back on rather than making a second entry.
Every add route records the folder it was given, so this is only needed when nothing is being ingested. The CLI uses it because it walks a folder itself, to report per-file progress, and then adds one FILE at a time: nothing it sends would otherwise tell the daemon a folder was involved.
An EMPTY folder is a normal thing to link. Pointing a recorder at a folder means linking it before the first file exists.
POST
Put a folder on the watch list