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/rectify-handler.ts

@@ -0,0 +1,23 @@
+import type { IDataRectify } from "../data-rectify.interface";
+import type { HandlerResponse } from "./handler-types";
+
+export type RectifyHandlerInput = {
+  subjectId: string;
+  collection: string;
+  field: string;
+  value: unknown;
+};
+
+export function createRectifyHandler(dataRectify: IDataRectify) {
+  return async (
+    input: RectifyHandlerInput,
+  ): Promise<HandlerResponse<{ ok: true }>> => {
+    await dataRectify.updateSubjectField(
+      input.subjectId,
+      input.collection,
+      input.field,
+      input.value,
+    );
+    return { status: 200, body: { ok: true as const } };
+  };
+}