Written because the walkthrough only existed in a chat log, and a new machine
reads its instructions from the clone.
Leads with the thing that will otherwise look like a bug: a first sign-in can
produce a NEW EMPTY account rather than one you already had, because Granthi
refuses to hand over an existing account just because the login name lines up.
The guide explains why that rule exists and gives both ways forward -- fresh
account (recommended, since the saved token acts as whatever account it is
bound to) or joining an existing one via a verified email match.
Also documents what people actually trip on: an empty `list` is a permissions
answer not a failure; a bare repo name that matches two teams is refused
rather than guessed; sign-out takes effect at the server, immediately; and
restore always writes to a new folder.
Plain language throughout, per the estate's 5th-grade rule for docs.
Verified: all 13 commands and every flag referenced exist in the client.
