chore(template): clean-slate template snapshot from bb4a0c7

Curated, product-agnostic snapshot of the post-story-04 tree: demo
content deleted, auth-only reference feature, web-next shell, all gates
green. Product-specific docs, ADRs 027-029, PRDs/epics/archive, editor
library traces, and product naming are curated out; generic template
repairs (coverage provider devDeps, root test:coverage script, live
lint fixes, root-only release-please) are kept. See TEMPLATE.md for
provenance, curation list, and usage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

turbo/generators/templates/realtime/handler/handler.test.ts.hbs

@@ -0,0 +1,17 @@
+// packages/{{kebabCase feature}}/src/realtime/handlers/on-{{kebabCase channelSlug}}.handler.test.ts
+import { describe, it, expect } from "vitest";
+import { on{{pascalCase channelSlug}}Handler } from "@/realtime/handlers/on-{{kebabCase channelSlug}}.handler";
+
+describe("on{{pascalCase channelSlug}}Handler", () => {
+  it("returns a function (factory shape)", () => {
+    const handler = on{{pascalCase channelSlug}}Handler();
+    expect(typeof handler).toBe("function");
+  });
+
+  it("does not throw on a valid stub input", async () => {
+    const handler = on{{pascalCase channelSlug}}Handler();
+    await expect(
+      handler({} as never, { userId: "u1", roles: [] }),
+    ).resolves.toBeUndefined();
+  });
+});