The Matrix adapter read MATRIX_RECOVERY_KEY via os.getenv, so under
gateway.multiplex_profiles every profile resolved the default profile's
key. That produced "recovery key verification failed: Key MAC does not
match" and broke E2EE for secondary profiles (#69090).
Route the read through agent.secret_scope.get_secret, which honors the
active profile's scope, with an os.getenv fallback for an unscoped read
under multiplex (default-profile startup loop) — mirroring the Slack
app-token pattern (#59739). Applied to both the startup verification
site and the status diagnostic.
Fixes#69090
153442dd5b