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/api.go

@@ -836,6 +836,30 @@ type TickTrace struct {
 	Rules  []RuleTrace `json:"rules"`
 }
 
+// --- Turn decision trace DTOs (V-564) ---
+
+// TurnClaim — one claimant's say on one turn: who, at which stage, what it
+// would have made the turn, the score it reported if it has one, and what
+// happened to the claim. Same shape as RuleTrace above and for the same reason:
+// a winner alone does not explain an arbitration, the losers do.
+type TurnClaim struct {
+	Stage    string  `json:"stage"`
+	Claimant string  `json:"claimant"`
+	Intent   string  `json:"intent,omitempty"`
+	Score    float64 `json:"score,omitempty"`
+	HasScore bool    `json:"has_score,omitempty"`
+	Outcome  string  `json:"outcome"`
+	Reason   string  `json:"reason,omitempty"`
+}
+
+// TurnDecision — one turn's arbitration, newest first when read as a list.
+type TurnDecision struct {
+	Ts        time.Time   `json:"ts"`
+	Utterance string      `json:"utterance"`
+	Winner    string      `json:"winner"`
+	Claims    []TurnClaim `json:"claims"`
+}
+
 // MorningRoutineItem — one checklist entry's current state.
 type MorningRoutineItem struct {
 	Key   string `json:"key"`