Adding repo after 2 days of vibecoding

public/src/rng.js

@@ -0,0 +1,30 @@
+export function fnv1a32(str) {
+  let h = 0x811c9dc5;
+  for (let i = 0; i < str.length; i++) {
+    h ^= str.charCodeAt(i);
+    h = Math.imul(h, 0x01000193);
+  }
+  return h >>> 0;
+}
+
+export function hash2u32(a, b, seed = 0) {
+  // 2D integer hash -> uint32 (cheap, stable)
+  let x = (a | 0) + 0x9e3779b9 + (seed | 0);
+  let y = (b | 0) + 0x85ebca6b;
+  x ^= y + 0x27d4eb2d + (x << 6) + (x >>> 2);
+  x = Math.imul(x ^ (x >>> 16), 0x7feb352d);
+  x = Math.imul(x ^ (x >>> 15), 0x846ca68b);
+  x ^= x >>> 16;
+  return x >>> 0;
+}
+
+export function mulberry32(seedU32) {
+  let t = seedU32 >>> 0;
+  return function rand() {
+    t += 0x6d2b79f5;
+    let r = Math.imul(t ^ (t >>> 15), 1 | t);
+    r ^= r + Math.imul(r ^ (r >>> 7), 61 | r);
+    return ((r ^ (r >>> 14)) >>> 0) / 4294967296;
+  };
+}
+