feat: distribute the showcase fulfillment actors over gRPC under supervision#96
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…rvision Signed-off-by: Joshua Temple <joshua.temple@stablekernel.com>
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Distributes the showcase's fulfillment actors across a cluster over real gRPC, supervised. The same kitchen and courier behaviors that run in-process in the durable order saga are now hosted as remote cluster actors on separate worker nodes and driven entirely from a coordinator node over the wire — demonstrating that the fulfillment actors are location-transparent.
A coordinator spawns the kitchen on worker-a and the courier on worker-b over gRPC (carried in-memory by bufconn), worker-a's supervisor restarts the kitchen actor after a crash, and the coordinator then delivers the actor-driving signals across the wire to drive each remote actor to completion. Adds the
clusterandtransportdependencies to the example.