The session held a wallet of up to six accounts, and a request picked one by a header or an
?account= parameter. It now holds one: user_id and its epoch. A sign-in replaces whoever was
signed in, sign-out and account deletion end the session, and an account refused mid-session
(revoked, suspended, deactivated) clears it. /api/me/accounts and /api/me/switch are gone, and
with them their refusal codes and the UI copy for them.
A cookie the multi-account build wrote carries no single epoch and is refused: its holder signs
in once more. A Google link finishing in a browser now signed in as someone else is refused, as
before for an account outside the wallet. A test holds that no app code reads the wallet keys or
the account header again.
peter
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