Ledgers close with an over line, so the digest can say who won

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0141G6xqLeNRYEtviLWSB5Up

server/src/store.ts

@@ -10,7 +10,9 @@ export type LedgerLine =
 	| { t: 'room'; id: string; seats: number; createdAt: number }
 	| { t: 'seat'; id: WizardId; name: string; token: string; bot: boolean }
 	| { t: 'start'; seed: number }
-	| { t: 'turn'; at: number; inputs: Record<WizardId, TurnInput> };
+	| { t: 'turn'; at: number; inputs: Record<WizardId, TurnInput> }
+	/** Written after the turn that ends the duel, for anything that reads ledgers without the engine. */
+	| { t: 'over'; at: number; winner: WizardId | null; reason: string };
 
 export class Store {
 	constructor(private dir: string) {