chore: restore large files before ci coverage checks

A CI checkout omits every file over 50 MB, so verify and generate_pack
resolve those database entries against a disk that does not hold them and
report them missing. The generated README then stops matching the
committed one for a reason that has nothing to do with staleness.

restore_large_files.py writes them back from the release cache, matched by
SHA1 rather than by name, and only where the path is gitignored and
absent. The site workflow runs it, and refreshes the data directories, before
generating.

.github/workflows/build.yml

@@ -58,32 +58,7 @@ jobs:
         run: |
           mkdir -p .cache/large
           gh release download large-files -D .cache/large/ 2>/dev/null || true
-          python3 -c "
-          import hashlib, json, os, shutil
-          db = json.load(open('database.json'))
-          with open('.gitignore') as f:
-              ignored = {l.strip() for l in f if l.strip().startswith('bios/')}
-          cache = '.cache/large'
-          if not os.path.isdir(cache):
-              exit(0)
-          idx = {}
-          for fn in os.listdir(cache):
-              fp = os.path.join(cache, fn)
-              if os.path.isfile(fp):
-                  h = hashlib.sha1(open(fp, 'rb').read()).hexdigest()
-                  idx[h] = fp
-          restored = 0
-          for sha1, entry in db['files'].items():
-              path = entry['path']
-              if path in ignored and not os.path.exists(path):
-                  src = idx.get(sha1)
-                  if src:
-                      os.makedirs(os.path.dirname(path), exist_ok=True)
-                      shutil.copy2(src, path)
-                      print(f'Restored: {path}')
-                      restored += 1
-          print(f'Total: {restored} files restored')
-          "
+          python scripts/restore_large_files.py
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}