Function cosine

src/core/memory-graph.ts:66–77

(a: number[], b: number[])

}

function cosine(a: number[], b: number[]): number {
  const len = Math.min(a.length, b.length);
  if (len === 0) return 0;
  let dot = 0, normA = 0, normB = 0;
  for (let i = 0; i < len; i++) {
    dot += a[i] * b[i];
    normA += a[i] * a[i];
    normB += b[i] * b[i];
  }
  const denom = Math.sqrt(normA) * Math.sqrt(normB);
  return denom === 0 ? 0 : dot / denom;
}

function decayWeight(edge: MemoryEdge): number {
  const daysSinceCreation = (Date.now() - edge.createdAt) / 86_400_000;