OptionalConfigurationThe opaque, backend-specific configuration to create the session with (region, proxy, stealth,
persistent-context id, …). Typed as a record of unknown values rather than any so it stays
inspectable without losing type-safety at the boundary; the bound client narrows it.
The session-creation options the driver passes through to the Steel client. Deliberately a thin, opaque pass-through of the resolved provider/session configuration (region, stealth/proxy settings, persistent-context id, …) — the driver does not interpret these; the bound client does. Never carries inline secrets: credentials resolve through MJ's credential system upstream.