Fixed a bunch of code inconsistencies

tools/asset/cutscene/__main__.py

@@ -46,6 +46,7 @@ DCTS format (little-endian throughout):
     item stream. Every pool entry starts 4-byte aligned.
 """
 
+import argparse
 import json
 import os
 import struct
@@ -428,9 +429,18 @@ def process_json(json_path):
 
 
 def main():
-  args = sys.argv[1:]
+  parser = argparse.ArgumentParser(
+    description="Generate DCTS binary cutscene files from raw JSONC "
+                 "cutscene definitions"
+  )
+  parser.add_argument(
+    'paths', nargs='*',
+    help='JSONC cutscene file(s) to process. If omitted, processes all '
+         'assetsraw/cutscenes/*.jsonc'
+  )
+  args = parser.parse_args()
 
-  if not args:
+  if not args.paths:
     cutscenes_dir = os.path.join(ASSETSRAW_DIR, 'cutscenes')
     if not os.path.isdir(cutscenes_dir):
       print(f"No directory found: {cutscenes_dir}")
@@ -447,7 +457,7 @@ def main():
       process_json(p)
     return
 
-  for p in args:
+  for p in args.paths:
     process_json(p)