load_gateway_config only forwarded the top-level multiplex_profiles
key, ignoring the nested gateway.multiplex_profiles form. The latter
is what `hermes config set gateway.multiplex_profiles true` writes,
so users who ran that command got multiplex_profiles=False silently
— no warning, no fallback, profile_routes just stopped matching.
Loader now checks the top-level key first, falls back to the nested
gateway section, and only then defaults to False. Same precedence is
applied to other nested-form keys (profile_routes already did this).
Tests cover: top-level honored, nested honored (regression test for
the silent-fallback bug), default False, top-level overrides nested.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
d7993ab178