Carry the worker's completion handoff into the synthetic creator wake
turn and label it as an automatic notification with inspect-the-board /
don't-recreate guidance, so a woken orchestrator doesn't re-decompose
work that already exists (#70752).
Salvaged from PR #71100 by @yinkev; ported onto the restructured wake
region (delivery_mode gating, scope_id, sub chat_id destinations). The
auto_subscribe_on_create config-default half of the original PR was
dropped as already superseded on main.
e5fd1c7b43