api_server's __init__ API_SERVER_KEY read now matches the scoped
_expected_api_key path. tests/gateway/test_adapter_startup_secret_scope.py
asserts, for every migrated module: helper exists, scoped read wins, scoped
miss returns default (no environ borrow), unscoped-under-multiplex falls back
to environ without raising, and legacy single-profile reads still work.
Teknium