An installed unit must equal the render but for the copy id, so a
re-pin that adds --sso refused render-refused. case2-unit gains --check
(every render check, nothing written) and --check-new (a first install's
checks). stack-upgrade runs both checks before anything stops, and
--next-args reads root's <instance>.args.next: equal before -- but for
--copy, different after it. After the stage it moves the installed unit
files into a new <instance>.replaced.XXXXXX directory and renders a
first install. A failure moves them back unchanged and restarts the old
copy, and confirm swaps the args file. The run sheet gives the commands,
the rollback past the migration included.
A stamped rehearsal now starts an isolated provider on 127.0.0.1 port 0
with a certificate and keys made for the run. It serves discovery and a
JWKS for the live provider ids and answers 403 to authorize and token.
Only the scratch Console trusts its certificate. The gate requires each
provider ready (sso-ready); provider-discovery requires discovery and
JWKS fetches and no code or token request. The provider stops with the
run, and by itself once the run's shell is gone.
The system-path test helper asserts the log's from copy again. The
pinned-copy sign-in requests are bounded, and cleanup waits for each
Console to exit.