fix: limpiar caché de AllowedGroups al activar gating por grupos

Co-authored-by: aider (openrouter/openai/gpt-5) <aider@aider.chat>

src/services/reminders.ts

@@ -92,7 +92,11 @@ export class RemindersService {
     // Determinar si aplicar gating por grupos
     const enforce = String(process.env.GROUP_GATING_MODE || 'off').toLowerCase() === 'enforce';
     if (enforce) {
-      try { (AllowedGroups as any).dbInstance = this.dbInstance; } catch {}
+      try {
+        (AllowedGroups as any).dbInstance = this.dbInstance;
+        // Evitar falsos positivos por caché obsoleta entre operaciones previas del test
+        AllowedGroups.clearCache?.();
+      } catch {}
     }
 
     for (const pref of rows) {