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

apps/storybook/test-runner.config.ts

@@ -0,0 +1,13 @@
+import type { TestRunnerConfig } from "@storybook/test-runner";
+
+const config: TestRunnerConfig = {
+  async preVisit(page) {
+    page.on("console", (msg) => {
+      if (msg.type() === "error") {
+        throw new Error(`Console error in story: ${msg.text()}`);
+      }
+    });
+  },
+};
+
+export default config;