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/event/consume/handler.ts.hbs

@@ -0,0 +1,14 @@
+// packages/{{kebabCase feature}}/src/events/handlers/on-{{kebabCase publisher}}-{{kebabCase event}}.handler.ts
+import type { {{pascalCase event}}Event } from "@repo/{{kebabCase publisher}}";
+
+export type IOn{{pascalCase publisher}}{{pascalCase event}}Handler = ReturnType<
+  typeof on{{pascalCase publisher}}{{pascalCase event}}Handler
+>;
+
+export const on{{pascalCase publisher}}{{pascalCase event}}Handler =
+  () =>
+  async (_event: {{pascalCase event}}Event): Promise<void> => {
+    // TODO: implement the reaction. Inject dependencies via the factory's
+    // constructor and use them here. The handler runs inside the consumer's
+    // span+capture sandwich, so just throwing on failure is the right shape.
+  };