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

packages/core-dsr/src/handlers/delete-handler.ts

@@ -0,0 +1,20 @@
+import type { IDataDelete } from "../data-delete.interface";
+import type { DeletionMode, DeletionCertificate } from "../dsr-types";
+import type { HandlerResponse } from "./handler-types";
+
+export type DeleteHandlerInput = {
+  subjectId: string;
+  mode: DeletionMode;
+};
+
+export function createDeleteHandler(dataDelete: IDataDelete) {
+  return async (
+    input: DeleteHandlerInput,
+  ): Promise<HandlerResponse<DeletionCertificate>> => {
+    const cert = await dataDelete.deleteSubjectData(
+      input.subjectId,
+      input.mode,
+    );
+    return { status: 200, body: cert };
+  };
+}