hermes_cli/container_boot.py resolved multiplexing from the
GATEWAY_MULTIPLEX_PROFILES env var only, while the gateway runtime
resolves env -> config.yaml -> default. A deployment enabling
multiplex_profiles via config.yaml alone therefore auto-started every
named profile's gateway slot at boot, which then crash-looped in the
double-bind guard against the multiplexing default gateway.
Resolve through load_gateway_config().multiplex_profiles (the shared
resolver, so env override precedence is preserved) and fall back to the
env var only when config loading fails.
Salvage of #85437 (test module trimmed to config-only + env-override).
Fixes#85413
ea9924b09c