Module sink 

Sink node trait and adapter.

A Sink has ≥1 inputs and 0 outputs. It consumes messages from one input per step() and commits them to an external side effect (file, stdout, GPIO, network, etc.). No dynamic dispatch in the hot path; everything is monomorphized.

Design goals:

• Minimal trait to implement a new sink.
• Default input-selection strategy (first non-empty), overridable per sink.
• Adapter SinkNode<S, InP, IN> that implements Node<IN, 0, InP, ()>.
• Implicit From<S> so graphs can take impl Into<SinkNode<...>> and users never have to mention the adapter type.

Structs

SinkNode

A thin adapter that exposes a Sink as a Node<IN, 0, InP, ()>.

Traits

Sink

Uniform contract for sink implementations (≥1 inputs / 0 outputs).