Public API for SPK kernel access.
Telemetry-free variant of position_at/3 for high-volume hot paths.
position_at/3
@spec loaded?() :: boolean()
@spec position_at(integer(), integer(), float()) :: {:ok, {float(), float(), float()}} | {:error, term()}
@spec position_at_fast(integer(), integer(), float()) :: {:ok, {float(), float(), float()}} | {:error, term()}
@spec segments() :: [map()]