fix(runtime): prevent memory leaks and improve shutdown/stream handling across services

ts/classes.cert-provision-scheduler.ts

@@ -106,6 +106,13 @@ export class CertProvisionScheduler {
     }
   }
 
+  /**
+   * Clear all in-memory backoff cache entries
+   */
+  public clear(): void {
+    this.backoffCache.clear();
+  }
+
   /**
    * Get backoff info for UI display
    */