the ring reads out over ipc as turn decisions (V-564)

Same shape as TickTrace and RecentEvents: a bounded daemon ring, so the store
adapter refuses rather than pretending a table exists. No voice wiring means an
empty list and not an error, because a box with no voice path has had no turns
to arbitrate.

internal/ipc/storeapi.go

@@ -265,6 +265,12 @@ func (a *storeAPI) TickTrace(ctx context.Context) (TickTrace, error) {
 	return TickTrace{}, errors.New("store: tick trace not available via direct store API")
 }
 
+// TurnDecisions — same story as TickTrace: the arbitration record is a daemon
+// ring, not a table, so there is nothing here to read it from (V-564).
+func (a *storeAPI) TurnDecisions(ctx context.Context, n int) ([]TurnDecision, error) {
+	return nil, errors.New("store: turn decisions not available via direct store API")
+}
+
 // SeedEvent — same shape as MorningStatus: writing the fact is a store call,
 // but extraction and detect-and-propose live in mavend, and a seed that wrote
 // the fact without running them would be the one thing this seam must not be,