[bug] gRPC UTF-8 Transport Error

[KCarretto]

Imix Logs:

 2026-02-03T01:50:25.757Z INFO  imix::agent       > Flushing 0 task outputs
 2026-02-03T01:50:25.758Z INFO  imix::run         > Callback complete (duration=0s, sleep=5s)
 2026-02-03T01:50:29.382Z ERROR transport::grpc   > failed to receive gRPC stream response: status: Internal, message: "grpc: failed to unmarshal the received message: string field contains invalid UTF-8", details: [], metadata: MetadataMap { headers: {} }
 2026-02-03T01:50:29.383Z INFO  imix::portal::run > Transport channel closed (resp_rx), shutting down portal loop
 2026-02-03T01:50:29.388Z ERROR imix::portal::tcp > Error reading from TCP socket 10.10.249.118:3389: Os { code: 10054, kind: ConnectionReset, message: "An existing connection was forcibly closed by the remote host." }
 2026-02-03T01:50:30.879Z INFO  imix::run         > Callback success
 2026-02-03T01:50:30.987Z INFO  imix::agent       > Flushing 0 task outputs
 2026-02-03T01:50:30.987Z INFO  imix::run         > Callback complete (duration=0s, sleep=5s)