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Replace optional<T> state_ in StatefulEntityBase with pure virtual get_state()/set_state_value_() that subclasses implement. BinarySensor stores its value in the existing public bool state member and uses EntityBase::flags_.has_state instead of the optional's discriminant. Move trigger_on_initial_state_ into EntityBase::flags_ (1 bit from reserved), eliminating the standalone bool and its padding. Saves 8 bytes per BinarySensor instance: - optional<bool> (2B) + padding (2B) = 4B removed - bool trigger_on_initial_state_ (1B) + padding (3B) = 4B removed
