benecaster_bridge_supports_manual_membership()

Returns whether the specified bridge supports programmatic manual subscriber creation — the operation behind the “Add subscriber manually” admin action. Wraps the benecaster_bridge_supports_manual_membership filter with the correct NativeBridge-slug default so callers do not need to replicate the default logic themselves.

Returns true for benecaster_builtin without calling the filter when no overrides are registered. Returns false for all other bridge slugs unless a bridge add-on hooks the filter. Safe to call anywhere — no DB or API call is made.