fix: allow undefined directory in test diff calls

Author: Aleexc12

packages/daemon/src/__tests__/helpers.ts

@@ -72,7 +72,7 @@ export class FakeOpencodeRegistry implements OpencodeRuntimeManager {
 	readonly diffCalls: Array<{
 		instanceId: string;
 		sessionId: string;
-		directory: string;
+		directory: string | undefined;
 	}> = [];
 	readonly diffsBySession = new Map<string, FileDiff[]>();
 	globalMaxConcurrent = 0;