jetstream v2 in zig stream.waow.tech

docs: name the NBD-in-use trap on the power-loss recipe master

A killed run leaves its NBD device claimed inside the Docker VM. The next run fails with 'nbd: nbdN already in use' while /sys/block/nbdN still reports size=0 and no pid, which reads like a Stream failure and is not. Cost an hour and three attempts to characterize; pointing STREAM_POWERLOSS_DEVICE at another device clears it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>


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