Drives the real core loop through CoreController with the pixelpass
override pointed at fake shell scripts (a host that emits its ticket and
dies; one that lives until signalled). The command loop has no unit
seam, so this is the only harness reaching the fault handler.
Half 1 pins the whole death path: ScreenShareStopped arrives BEFORE the
"ended unexpectedly" error. Half 2 stops a share deliberately and then
requires silence while the retired host's late stdout EOF lands as a
stale fault. The `exec sleep` in the living host is load-bearing: it
makes SIGINT close stdout so the stale fault actually arrives, keeping
the staleness assertion non-vacuous.
Both core-side mutants verified killed: swallowing the forwarder's fault
times out half 1; disabling the staleness gate panics half 2 with the
spurious re-emitted ScreenShareStopped.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
molluskandClaude Fable 5
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