Context

DX-9464 changed global fields export from a single bulk-array file (globalfields.json) to individual per-uid files ({uid}.json). The 4 official seed repos still ship the old bulk-array format, which breaks the seed command's import flow — specifically readGlobalFieldSchemas reads the array as a single element, .uid is undefined, and the SDK never assigns .fetch, causing a TypeError: .fetch is not a function at import time.

Changes:

1. Added individual {uid}.json files alongside the existing globalfields.json in stack/global_fields/
2. Keep globalfields.json intact (backward compat)
3. Cut a new release so the seed command picks up the updated tarball

Per-uid file format

Each file is a plain JSON object matching the global field schema:

{
  "title": "Card",
  "uid": "card",
  "description": "",
  "schema": [...]
}