D310 - The worker reads requests on its own thread

Status: decided Date: 2026-08-27

The worker reads requests on a dedicated thread while the guest runs. A shell request is applied on that thread and produces no reply, so the event stream keeps exactly one writer.

Why: guest code runs in a child process, and a request read only between runs arrives after the run it was meant to interrupt. A reply from the reader thread would interleave with the run's own events and corrupt the stream only under the timing this exists for, so the property is asserted as no event.

Rejected:

• Send-once-then-listen: no in-flight control except termination.
• Replying to shell requests: a second writer on the stream.