quash: query parameters for just, has, and do, and some general simplification

www/src/lib/rate-limit.ts

@@ -0,0 +1,15 @@
+const requests = new Map<string, number[]>();
+
+export function isRateLimited(key: string, maxRequests: number, windowMs: number): boolean {
+  const now = Date.now();
+  const timestamps = requests.get(key) ?? [];
+  const recent = timestamps.filter(t => now - t < windowMs);
+
+  if (recent.length >= maxRequests) {
+    return true;
+  }
+
+  recent.push(now);
+  requests.set(key, recent);
+  return false;
+}