Update default output dir

unpack.py

@@ -9,11 +9,11 @@ Usage:
     python unpack.py [--output /path/to/output] [--subset real_world|synthetic] [--jobs N]
 
 Examples:
-    # Extract everything to ./Cloud4D
+    # Extract everything to ./
     python unpack.py
 
     # Extract to a specific location
-    python unpack.py --output /data/Cloud4D
+    python unpack.py --output /data/cloud4d
 
     # Extract only real_world data
     python unpack.py --subset real_world
@@ -87,15 +87,15 @@ def main():
         formatter_class=argparse.RawDescriptionHelpFormatter,
         epilog="""
 Examples:
-    python unpack.py                           # Extract all to ./Cloud4D
-    python unpack.py --output /data/Cloud4D    # Extract to specific location
+    python unpack.py                           # Extract all to ./
+    python unpack.py --output /data/cloud4D    # Extract to specific location
     python unpack.py --subset real_world       # Extract only real_world
     python unpack.py --filter 20230705         # Extract matching archives
     python unpack.py --jobs 4                  # Parallel extraction
         """
     )
-    parser.add_argument('--output', '-o', type=Path, default=Path('./Cloud4D'),
-                        help='Output directory (default: ./Cloud4D)')
+    parser.add_argument('--output', '-o', type=Path, default=Path('./'),
+                        help='Output directory (default: ./)')
     parser.add_argument('--subset', choices=['real_world', 'synthetic'],
                         help='Extract only a specific subset')
     parser.add_argument('--filter', type=str,