* feat(pairing): Add server and orca environment add exchange the link for their own token
After verifying the host, Add server (and repair) swap the access link's
token for one generated on this computer when the host advertises
pairing.ticket-exchange.v1, and save that instead. orca environment add does
the same with a short best-effort probe. Any failure saves the link as today;
the host keeps accepting it until the new token is used.
* test(pairing): Add server and CLI leave links unchanged for a released host
* fix(pairing): Add server and orca environment add sign in once after exchanging, and the CLI rejects a refused code
After exchanging a link, sign in once with the new token so the host
retires the link right away instead of at the first later use; a host
downgraded in between would not know the new token.
orca environment add no longer saves a pairing code the host refuses
(for example one another device already used); it asks for a new code.
Neil
e1379b34f3