fix: reports hold the data trees they read

generate_readme, generate_site and slots resolve against data/ but took no hold when run on their own, as the documented commands do. A refresh swapping a tree mid-read then gave counts from half of it. Each now holds the trees shared, like verify and the builder.

scripts/generate_readme.py

@@ -772,9 +772,18 @@ def main() -> None:
     )
     args = parser.parse_args()
 
+    import contextlib
+
+    from common import load_data_dir_registry
+    from refresh_data_dirs import hold_data_dirs
+
     db = load_database(args.db)
 
-    readme = generate_readme(db, args.platforms_dir)
+    # Coverage resolves against data/: a refresh swapping a tree mid-read
+    # published counts taken from half of it.
+    with contextlib.ExitStack() as held:
+        hold_data_dirs(held, load_data_dir_registry(args.platforms_dir))
+        readme = generate_readme(db, args.platforms_dir)
     status = "Generated" if write_if_changed("README.md", readme) else "Unchanged"
     print(f"{status} ./README.md")
 

scripts/generate_site.py

@@ -4395,7 +4395,14 @@ def main() -> None:
     try:
         # Two runs over one docs/ delete each other's pages and scratch
         # files in the sweep, so the second is refused instead.
-        with artifact_lock(args.docs_dir):
+        import contextlib
+
+        from common import load_data_dir_registry
+        from refresh_data_dirs import hold_data_dirs
+
+        # The coverage pages resolve against data/, held while they are read.
+        with artifact_lock(args.docs_dir), contextlib.ExitStack() as held:
+            hold_data_dirs(held, load_data_dir_registry(args.platforms_dir))
             _generate(args)
     except ArtifactLockBusy as exc:
         print(f"ERROR: {exc}", file=sys.stderr)

scripts/slots.py

@@ -894,6 +894,16 @@ def main() -> int:
     )
     args = parser.parse_args()
 
+    import contextlib
+
+    from common import load_data_dir_registry
+    from refresh_data_dirs import hold_data_dirs
+
+    # Claims resolve against data/: the trees stay put until the process
+    # ends, which releases the hold.
+    held = contextlib.ExitStack()
+    hold_data_dirs(held, load_data_dir_registry(args.platforms_dir))
+
     db = load_database(args.db)
     profiles = load_emulator_profiles(args.emulators_dir)
     if args.platform: