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func (c *Client) ExecuteWithRetry(ctx context.Context, req *Request, maxAttempts int) (*Response, error) {
	var lastErr error
	for attempt := 0; attempt < maxAttempts; attempt++ {
		if attempt > 0 {
			select {
			case <-ctx.Done():
				return nil, ctx.Err()
			case <-time.After(backoff(attempt)):
			}
		}
		resp, err := c.execute(ctx, req)
		if err == nil {
			return resp, nil
		}
		if !isRetryable(err) {
			return nil, err
		}
		lastErr = err
	}
	return nil, fmt.Errorf("all %d attempts failed: %w", maxAttempts, lastErr)
}

// ExecuteWithRetry sends req and retries on retryable errors with
// exponential backoff, up to maxAttempts total attempts.
//
// Each retry waits for the duration returned by backoff(attempt) or
// until ctx is cancelled. Non-retryable errors (see isRetryable) are
// returned immediately without further attempts.
//
// Returns the first successful Response, or an error wrapping the last
// failure if all attempts are exhausted. Returns ctx.Err() if the
// context is cancelled between retries.
func (c *Client) ExecuteWithRetry(ctx context.Context, req *Request, maxAttempts int) (*Response, error) {