Add a messenger between two nodes, sealed end to end

examples/messenger.aup keeps the lines typed here and sends each to the
other node, and keeps the other's. The check runs Alice's and Bob's
nodes, each with a key of its own, sealing to the other's and taking
lines only from the other (pure-serve --key, --send, --seal, --sender),
each drawn by Vega in the node, with a relay between them: a line typed
on Alice's display reaches Bob's node and is drawn on his, Bob's answer
posted by a program is drawn on hers, each last frame is the one the
vega command draws from that node's store, and the relay saw no line's
text nor a field's name, only one sealed session each way naming the
sender's key.

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