Initial commit: digital reception monorepo (M1-M11 + demo extensions)

apps/fixtures-runner/src/embedding.ts

@@ -0,0 +1,40 @@
+/** Детерминированный 512-d L2-нормализованный псевдо-эмбеддинг. */
+import { createHash } from 'node:crypto';
+
+function seededRandom(seed: number): () => number {
+  let s = seed >>> 0;
+  return () => {
+    s = (s * 1664525 + 1013904223) >>> 0;
+    return s / 0xffffffff;
+  };
+}
+
+export function makeEmbedding(seed: number, jitter = 0): number[] {
+  // Гауссово приближение через 12-tap uniform.
+  const rng = seededRandom(seed);
+  const jitterRng = seededRandom(seed + Math.floor(jitter * 1000) + 7);
+  const vec = new Array<number>(512);
+  let norm = 0;
+  for (let i = 0; i < 512; i++) {
+    let s = 0;
+    for (let k = 0; k < 12; k++) s += rng();
+    const base = s - 6;
+    let noise = 0;
+    if (jitter > 0) {
+      let s2 = 0;
+      for (let k = 0; k < 12; k++) s2 += jitterRng();
+      noise = (s2 - 6) * jitter;
+    }
+    const v = base + noise;
+    vec[i] = v;
+    norm += v * v;
+  }
+  norm = Math.sqrt(norm) || 1;
+  for (let i = 0; i < 512; i++) vec[i] /= norm;
+  return vec;
+}
+
+/** Хеш для логов. */
+export function embeddingFingerprint(embedding: number[]): string {
+  return createHash('sha1').update(embedding.slice(0, 32).join(',')).digest('hex').slice(0, 12);
+}