Items lost on send error in edgeTransferSendMessage — no rollback

[ILLISIS]

Bug

In instance.ts, edgeTransferSendMessage catches send errors and rethrows them, but never returns the transferred items to the source. A // TODO return items comment in the code confirms this is a known incomplete implementation.

Code

// instance.ts:476-480
// We assume the transfer did not happen if an error occured.
} catch (err) {
    throw err;
    // TODO return items
}

Impact

If sendTo throws (e.g. the partner instance is offline, network timeout, or message rejected), the items/fluids/power that were deducted from the source side are never returned. The resources are permanently lost with no recovery mechanism.

Expected behaviour

On a send failure, the transferred resources should be returned to the source instance so the game can re-attempt the transfer on the next tick. At minimum, the failure should be logged with enough detail (edge ID, transfer contents) to allow manual recovery.