Method reportFailure

src/node/runtime/sshConnectionPool.ts:406–409

* Report a connection failure. * Call when SSH operations fail due to connection issues (not command failures). * This triggers backoff to prevent thundering herd on a failing host.

(config: SSHConnectionConfig, error: string)

   * This triggers backoff to prevent thundering herd on a failing host.
   */
  reportFailure(config: SSHConnectionConfig, error: string): void {
    const key = makeConnectionKey(config);
    this.markFailedByKey(key, error);
  }

  /**
   * Mark connection as healthy by key (internal use)