fix: name the platform a typo meant in every CLI

slots ended a mistyped --platform on a traceback; generate_truth,
refresh_data_dirs and auto_fetch exited 0 having done nothing for it.
All six now stop on require_platform before any work.

scripts/auto_fetch.py

@@ -32,6 +32,7 @@ from common import (
     list_registered_platforms,
     load_database,
     load_platform_config,
+    require_platform,
     require_yaml,
 )
 
@@ -441,6 +442,7 @@ def main() -> None:
             include_archived=True,
         )
     elif args.platform:
+        require_platform(args.platform, args.platforms_dir)
         platforms = [args.platform]
     else:
         parser.error("Specify --platform or --all")

scripts/diff_truth.py

@@ -20,6 +20,7 @@ from common import (
     list_registered_platforms,
     load_platform_config,
     native_layer,
+    require_platform,
     require_yaml,
     truth_target_dir,
     yaml_load,
@@ -187,6 +188,7 @@ def main() -> None:
             args.platforms_dir, include_archived=True
         )
     else:
+        require_platform(args.platform, args.platforms_dir)
         platforms = [args.platform]
 
     reports: list[dict] = []

scripts/export_native.py

@@ -28,7 +28,13 @@ from pathlib import Path
 sys.path.insert(0, str(Path(__file__).resolve().parent))
 
 from artifacts import file_lock, write_bytes_atomic, write_text_atomic
-from common import list_registered_platforms, load_platform_config, native_layer, yaml_load
+from common import (
+    list_registered_platforms,
+    load_platform_config,
+    native_layer,
+    require_platform,
+    yaml_load,
+)
 from exporter import discover_exporters
 from exporter.baseline import HASH_FIELDS, _hash_values, _single_size, build_native_model
 
@@ -535,6 +541,7 @@ def main() -> None:
             include_archived=True,
         )
     else:
+        require_platform(args.platform, args.platforms_dir)
         platforms = [args.platform]
 
     sys.exit(

scripts/generate_truth.py

@@ -19,6 +19,7 @@ from common import (
     load_emulator_profiles,
     load_platform_config,
     load_target_config,
+    require_platform,
     require_yaml,
     truth_target_dir,
     write_text_atomic,
@@ -88,6 +89,7 @@ def main(argv: list[str] | None = None) -> None:
             include_archived=True,
         )
     else:
+        require_platform(args.platform, args.platforms_dir)
         platforms = [args.platform]
 
     # A target-narrowed model is a different artifact: written under the

scripts/refresh_data_dirs.py

@@ -25,7 +25,7 @@ import urllib.request
 import zipfile
 from pathlib import Path
 from artifacts import file_lock as _file_lock
-from common import yaml_load
+from common import require_platform, yaml_load
 
 try:
     import yaml
@@ -539,6 +539,9 @@ def main() -> None:
         format="%(message)s",
     )
 
+    if args.platform:
+        # The registry sits in the platforms directory it serves.
+        require_platform(args.platform, os.path.dirname(args.registry) or ".")
     registry = load_registry(args.registry)
 
     if args.key:

scripts/slots.py

@@ -809,6 +809,7 @@ def main() -> int:
         list_registered_platforms,
         load_emulator_profiles,
         load_platform_config,
+        require_platform,
     )
 
     parser = argparse.ArgumentParser(
@@ -832,6 +833,8 @@ def main() -> int:
     with open(args.db, encoding="utf-8") as handle:
         db = json.load(handle)
     profiles = load_emulator_profiles(args.emulators_dir)
+    if args.platform:
+        require_platform(args.platform, args.platforms_dir)
     names = (
         [args.platform]
         if args.platform