Corrects the lesson written an hour ago, which said a non-204 was transient and
should simply be re-issued. It is reproducible and mechanical: `printf` with
`\"` inside the single-quoted format string drops the backslash, curl then ends
the quoted value at the first bare quote, and Jellyfin receives
`Authorization: MediaBrowser Token=` with an empty key. Both forms were run
against the host in one pass — `\\"` answers 204, `\"` answers 401 — so the
block's double backslashes are load-bearing, and the handoff script that deviated
left a 58k-move library unscanned for 40 minutes.
Also the trap that diagnosis walked into: a second accepted refresh while a scan
is running moves `Scan Media Library` to `Cancelling` and the pass starts over.
One accepted request is the procedure; wait it out.
Frank
02a568fb97