The host guard's stdin restore only dropped listeners a module added; a
module that removed a snapshot listener (e.g. a factory calling
process.stdin.removeAllListeners("data") when a subagent re-runs preloaded
factories against a live parent TUI) permanently stripped ProcessTerminal's
input handler. Reconcile each guarded event back to the pre-load snapshot:
when membership changed, removeAllListeners then re-add the snapshot in
order, restoring both additions dropped and removals reinstated. Snapshot
via rawListeners so once-wrapped handlers round-trip intact.
Fixes#5618
roboomp
d2aeaeced6