_daemon_subprocess_env copied dict(os.environ), which under multiplex is
the LAUNCH profile's: profile X's daemon started with the default
profile's HERMES_HOME and credentials. It now builds the child env with
served_profile_child_env(inherit_credentials=False) — the manager reads
the LLM keys from the profile's own 0600 env file, so the child needs no
credentials from us.
check_local_runtime spawned 'python -c import ... sentence_transformers'
(a torch cold start) from is_available(), unavailable_reason() and
initialize() on every session. The verdict is now kept per interpreter
path for the process; a reinstall publishes a new PM generation, so a
new path re-probes.