feat: add TS3 identity generation with Ed25519 keypairs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ts-protocol/identity.test.ts

@@ -0,0 +1,28 @@
+import { describe, it, expect } from "vitest";
+import { generateIdentity, exportIdentity, importIdentity } from "./identity.js";
+
+describe("TS3 Identity", () => {
+  it("generates a valid identity with keypair", () => {
+    const identity = generateIdentity();
+    expect(identity.publicKey).toBeInstanceOf(Uint8Array);
+    expect(identity.privateKey).toBeInstanceOf(Uint8Array);
+    expect(identity.publicKey.length).toBe(32);
+    expect(identity.privateKey.length).toBe(64);
+    expect(identity.uid).toBeTruthy();
+    expect(typeof identity.uid).toBe("string");
+  });
+
+  it("exports and imports identity consistently", () => {
+    const identity = generateIdentity();
+    const exported = exportIdentity(identity);
+    const imported = importIdentity(exported);
+    expect(imported.uid).toBe(identity.uid);
+    expect(imported.publicKey).toEqual(identity.publicKey);
+  });
+
+  it("generates unique identities each time", () => {
+    const id1 = generateIdentity();
+    const id2 = generateIdentity();
+    expect(id1.uid).not.toBe(id2.uid);
+  });
+});