A for:"ready" wait woke on any terminal state, but reported timedOut:false even
when readiness was never observed — the only success signal on the wait result —
so callers could chain work against a dead process. Split the wake predicate
from the ready-observed check: the wait still wakes on a terminal exit, but
timedOut now reflects whether readiness was actually observed (readyAt, live
ready, or a running daemon with no ready spec).
Fixes#6303