Compile queue: close the test gaps the #1728 reviews deferred #1731

Follow-up to #1728. The per-task reviews deferred these test gaps. None of them is a known defect, and the code paths read correct, but each is untested:

• Settles on a demoted node. SettleAdmission with Stored, NotStored or Failed on a node that has been demoted must still release the charge and the lease. Only WorkerRefused is tested.
• NoteDepartureCounted. The call in FrameEndpoint's AbandonIfPeerGone has no case driving it. Deleting it would double-count AdmissionAbandoned and nothing would go red. The gap is noted at the call site.
• The launcher's pendingRefusal / granted wiring in src/apps/pace-cc/main.cpp. main.cpp is in no test target. RunMiss's seams are tested, but the lambda that records a held plan refusal only after a grant is not.
• RelaysByVerb attribution (Responders.hpp). A non-relayed ADMIT on a follower, from a remote launcher or our own key, gets the forwarder's PeerWatchCounter. A departure is then filed as pace_admission_forward_abandoned_total.
• Refactor. PresenceRound's bool* reachedScheduler out-parameter should become a returned {accepted, reached} value, the house idiom.