Fix path references in scripts after reorganization

Update 8 scripts to use Path(__file__).parent.parent as PROJECT_ROOT
so they resolve data/, output/, and internet_cables/ relative to the
project root rather than the caller's working directory.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/make_data_center_map.py

@@ -222,8 +222,8 @@ def parse_args():
     )
     parser.add_argument(
         "--output",
-        default="data_center_map.html",
-        help="Output HTML path (default: data_center_map.html)",
+        default=str(Path(__file__).parent.parent / "output" / "data_center_map.html"),
+        help="Output HTML path (default: output/data_center_map.html)",
     )
     return parser.parse_args()