check_requirements() runs at gateway startup before any per-profile
secret scope is installed, and the scope-less get_secret path reads
only os.environ -- so a Bitwarden-managed BUZZ_PRIVATE_KEY (only
BWS_ACCESS_TOKEN in .env) was invisible to the platform gate and Buzz
was silently skipped with a misleading install hint (#95216). When no
scope is active and the process env has no value, consult a cached
one-shot build of the profile secret mapping (build_profile_secret_scope
resolves external secret sources); an active scope still shadows this
rung entirely, so multiplexed cross-profile isolation is unchanged.
BUZZ_RELAY_URL reads in the gate now go through the same helper so an
externally managed relay passes too.
a684d154bc