Add initial VibeGuard browser extension

tests/model-metadata.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+import { validateManifest } from "../src/inference/model-metadata";
+import { resolveOutputIndex } from "../src/inference/classifier";
+
+const manifest = {
+  source: "wagesj45/toxic-comment-classifier",
+  revision: "abc123",
+  architecture: "DistilBertForSequenceClassification",
+  labels: { toxic: 1, nonToxic: 0, names: { toxic: 1, non_toxic: 0 } },
+  maxLength: 512,
+  quantization: "int8-dynamic",
+  runtime: "onnxruntime-web-wasm"
+};
+
+describe("model contract", () => {
+  it("accepts a binary manifest and resolves common output labels", () => {
+    expect(validateManifest(manifest)).toEqual(manifest);
+    expect(resolveOutputIndex("LABEL_1", manifest)).toBe(1);
+    expect(resolveOutputIndex("not-toxic", manifest)).toBe(0);
+    expect(resolveOutputIndex("toxic", manifest)).toBe(1);
+  });
+
+  it("rejects incomplete metadata", () => {
+    expect(() => validateManifest({ ...manifest, labels: { toxic: 1, nonToxic: 1, names: {} } })).toThrow();
+    expect(() => validateManifest({ ...manifest, maxLength: 0 })).toThrow();
+    expect(() => validateManifest({ ...manifest, labels: undefined as unknown as typeof manifest.labels })).toThrow();
+  });
+});