feat(request): add a response-interceptor seam

Add `extraResponseInterceptors` next to the existing request-interceptor
seam and wire it into the request config, so build-time tooling can react
to responses (e.g. clear a one-shot request-scoped hint after a write
completes). Default is an empty list — no behavior change by default.

src/request.extensions.ts

@@ -13,3 +13,11 @@ export type RequestInterceptor = (
 ) => { url: string; options: Record<string, any> };
 
 export const extraRequestInterceptors: RequestInterceptor[] = [];
+
+// Response-side counterpart. Each interceptor receives the (successful)
+// response and returns it; tooling may overwrite this file to react to
+// responses (e.g. clearing a one-shot request-scoped hint after a write
+// completes). Default is an empty list.
+export type ResponseInterceptor = (response: any) => any;
+
+export const extraResponseInterceptors: ResponseInterceptor[] = [];