fix(cron): persist delivered flag in job state to surface delivery failures (openclaw#19174) thanks @simonemacario

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: simonemacario <2116609+simonemacario@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/gateway/protocol/schema/cron.ts

@@ -157,6 +157,7 @@ export const CronJobStateSchema = Type.Object(
     lastError: Type.Optional(Type.String()),
     lastDurationMs: Type.Optional(Type.Integer({ minimum: 0 })),
     consecutiveErrors: Type.Optional(Type.Integer({ minimum: 0 })),
+    lastDelivered: Type.Optional(Type.Boolean()),
   },
   { additionalProperties: false },
 );