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/vitest.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["*.test.ts", "lib/*.test.ts", "__tests__/*.test.ts"],
+    clearMocks: true,
+    restoreMocks: true,
+    // The core-package `*.e2e.test.ts` files each do a full `pnpm install`
+    // in a temp clone. Running them in parallel saturates the machine and
+    // trips vitest's worker RPC timeout ("Timeout calling onTaskUpdate").
+    // Run test files one at a time so each e2e test gets the box to itself.
+    fileParallelism: false,
+    // Each e2e test's `onTestFinished` cleanup `rmSync`-es a temp clone that
+    // contains a full installed `node_modules`. Deleting that many files can
+    // exceed vitest's 10s default hook timeout under load, so raise the
+    // ceiling to match the 120s per-test timeout.
+    hookTimeout: 120_000,
+  },
+});