feat: add a gRPC network transport in its own module#84
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Signed-off-by: Joshua Temple <joshua.temple@stablekernel.com>
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Adds a real gRPC network transport as a new
crucible/transportmodule, so a cluster spans processes over the wire while theclustercore stays stdlib-only — a deployment using only the in-memory transport never compiles gRPC in. The clientTransportsatisfiescluster.Transportand routes deliver/spawn to the gRPC server of the node that owns the target actor;NewServerserves a node'scluster.WireEndpoint. Payloads ride the wire as the JSON the wire-codec seam already produces, via a JSON gRPC codec and a hand-written service descriptor — no protobuf schema or codegen is introduced. The grpc dependency is isolated to this module (its own go.mod), matching the suite's pattern of confining heavy deps. Tested end to end over an in-memory gRPC connection (bufconn): remote spawn + deliver, server interceptor path, and error propagation. CI (lint/race-matrix/vuln/coverage@90) is wired for the new module. Coverage: transport 90.6 percent. Additive; new module.