fix(tooling): remove unused import in fill-missing-globes.py

ruff F401 — unused 'import os'. Pre-existing in the globe-coverage script; ruff
runs at pre-push (not pre-commit), so it surfaced only now and blocked the push.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tooling/fill-missing-globes.py

@@ -15,7 +15,6 @@ Usage:
 """
 
 import hashlib
-import os
 import shutil
 import sqlite3
 import sys