A reference is a request that outlives its provider: a missing provider or a version that does not fit leaves
it unbound, waiting for the name (failed { waiting }, a new FailureCause kind), local and remote alike. An
attempt parks until its dependencies are live, with no timer and no backoff, woken on every state change of a
dependency; its readyTimeout runs only for its own steps. Requests wait only for the host's publication (the
startup deadlock is gone); load resolves at the first outcomes of its host-lifetime objects. Getters wait through
waiting until their readyTimeout. Registry readers are waiting dependencies, woken at every usable value; a last
good value is dropped when a contribution it was built from leaves. Unbound holds count for keep-alive and are
revoked; retry passes on to failed blockers once per operation (operation id and visited list on the wire); the
dependency deadline is gone and parked_long reports a long wait on a remote attempt.
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