Violentmonkey on mobile Chromium does not intercept navigation to a
.user.js URL, so the Install link renders the script as text and there is
no way to get it installed. Adding ?download=1 sets Content-Disposition:
attachment on the same session-gated endpoint, so the Reader saves the
file and adds it from Violentmonkey's own menu.
The plain link stays inline on purpose: the updater polls the /u/ path and
an attachment disposition there would break auto-update. The test asserts
both halves.
Refs #26
sulthan
0830016729