refactor: reduce failure-classification API surface

sdk/src/query-failure-classification.ts

@@ -10,14 +10,14 @@ export function errorMessage(error: unknown): string {
   return error instanceof Error ? error.message : String(error);
 }
 
-export function parseTimeoutMs(message: string): number | undefined {
+function parseTimeoutMs(message: string): number | undefined {
   const m = message.match(/timed out after\s+(\d+)ms/i);
   if (!m) return undefined;
   const n = Number.parseInt(m[1], 10);
   return Number.isFinite(n) ? n : undefined;
 }
 
-export function isTimeoutMessage(message: string): boolean {
+function isTimeoutMessage(message: string): boolean {
   return /timed out after/i.test(message);
 }