Class WriteTransfer<T>

Write adapter for an arbitrary InputFlowInterface (e.g., Storage).

Capabilities: isInput, isPushable

Mechanics:

1. The constructor accepts config.flow: InputFlowInterface
2. push(data) — calls flow.write(data)
3. destroy() — does nothing (does not own the flow)

Error handling:

• If flow.write() throws an exception, onError is called.
• With onError provided, the exception is suppressed. Without onError — rethrown.

Configuration (WriteTransferConfig):

• flow: InputFlowInterface — target flow with a write() method
• onError?: ErrorHandler — error handler

Use cases:

• Writing data to Storage (LatestStorage, QueueStorage, StackStorage)
• Adapting an arbitrary object with write() to pipeline
• Finalization: saving the result to external storage