Minimal parameter-owning component for the dev robot.

Registers a hand-written param_schema/0 under [:gait], the way a real locomotion component would. The schema's {:in, values} type cannot be declared through the robot DSL's param entity, and it is what drives the parameter panel's fixed-set cycling — h/l on the gait.pattern row steps through the allowed values with wrap-around.

The process itself does nothing beyond the registration; the robot's runtime owns the parameter value once the schema is registered.