4396253aed
Follow-up to the salvaged #98571: forward the interrupt to the compute host whenever the parent 'running' mirror is stale, but only for sessions that actually have hosted activity — HostSupervisor.interrupt() calls start(), so an unconditional forward would spawn a compute-host child just to deliver an interrupt for an idle lazy session. Adds a regression test asserting the idle-lazy-session no-spawn path. Refs #92916