Struct SignaledCallback 

#[repr(C)]
pub struct SignaledCallback<'a> {
    pub cb_id: &'a str,
    pub ctx_ptr: *mut c_void,
}

Layer-clean substitute for nros::node_metadata::CallbackId + nros::node::CallbackCtx at the NodeDispatchRuntime boundary (Phase 216.A.2). nros-platform sits below nros in the dep graph, so the trait surface cannot reference those types directly. The nros-side runtime impl wraps a real (CallbackId, &mut CallbackCtx) pair into this opaque shape before invoking NodeDispatchRuntime::signal_callback; the concrete dispatcher casts ctx_ptr back to &mut nros::CallbackCtx<'_> at the call site.

#[repr(C)] keeps the layout stable across the (same-language today, FFI-shaped tomorrow) nros-platform ↔ nros boundary.

Fields

cb_id: &'a str

Stable identifier string carried by nros::CallbackId(&'a str).

ctx_ptr: *mut c_void

Erased pointer to the nros::CallbackCtx<'_> the dispatcher will drive. The nros-side NodeDispatchRuntime impl casts back to &mut nros::CallbackCtx<'_> before invoking the component body.