40378192b1
The login gate called GET /guilds/{guild}/members/{user} — the Guild
resource's Get Guild Member, which wants a Bot token and the application
present in the guild. Handed a user Bearer token it answers 401, which
discordMember reports as an error, so every sign-in rendered "Discord
sign-in is unavailable right now" and nobody could get in.
The endpoint guilds.members.read actually grants is Get Current User Guild
Member, GET /users/@me/guilds/{guild}/member. Same single-guild question,
same privacy property, and it takes the token we hold. #18 flagged this as
verified from Discord's documentation but never from a live flow; it was
wrong.
The stub mirrored the implementation, so the suite could not see it. It now
serves the OAuth path and answers the bot path 401 the way Discord does —
without that, a regression falls through to 404 and reads as an ordinary
"not a member" refusal instead of failing.