refactor: consolidate failure classification constructors

sdk/src/query-failure-classification.ts

@@ -21,12 +21,6 @@ export function isTimeoutMessage(message: string): boolean {
   return /timed out after/i.test(message);
 }
 
-export function isTimeoutLikeError(error: unknown): boolean {
-  if (!(error instanceof Error)) return false;
-  if (error.name === 'TimeoutError' || error.name === 'AbortError') return true;
-  return isTimeoutMessage(error.message);
-}
-
 export function timeoutMessage(command: string, args: string[], timeoutMs: number): string {
   return `gsd-tools timed out after ${timeoutMs}ms: ${command} ${args.join(' ')}`;
 }