pub type StepHandle = *mut c_void;Expand description
Opaque, plugin-allocated handle for one tool execution drive. Produced by
ToolExecuteFn, polled by ToolPollFn, cancelled by ToolCancelFn,
freed by ToolDestroyFn (exactly once, idempotent).
The handle’s interior layout is entirely plugin-private; the host treats it as an opaque pointer.