## Summary

- Remove the public `POST /api/v1/backchannel/scenarios/batch` gateway route.
- Drop the batch request/response schemas and OpenAPI registry entry from `@tilt/backchannel-api`.
- Remove the SIG client batch article scenario proxy method and parameter type.

## Testing

- `yarn workspace @tilt/backchannel-api build`
- `yarn nx run sig-api-client:types`
- `yarn nx run sig-api-client:lint`
- `yarn nx run web:types`
- `../../node_modules/.bin/vitest run --project default src/app/api/v1/backchannel/scenarios/search/route.test.ts --coverage=false`
- `npx tsx scripts/lint-file-rules.ts`