fix: handle non‑finite magnitude in L2 normalization and remove stale test reset

src/memory/embeddings.test.ts

@@ -330,7 +330,6 @@ describe("embedding provider local fallback", () => {
 describe("local embedding L2 normalization", () => {
   afterEach(() => {
     vi.resetAllMocks();
-    vi.resetModules();
     vi.unstubAllGlobals();
     vi.doUnmock("./node-llama.js");
   });

src/memory/embeddings.ts

@@ -8,7 +8,7 @@ import { importNodeLlamaCpp } from "./node-llama.js";
 
 function l2Normalize(vec: number[]): number[] {
   const magnitude = Math.sqrt(vec.reduce((sum, x) => sum + x * x, 0));
-  if (magnitude < 1e-10) return vec;
+  if (!Number.isFinite(magnitude) || magnitude < 1e-10) return vec;
   return vec.map((x) => x / magnitude);
 }