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Opens the four sealed box-secret columns back to plaintext (all or nothing; keeps api_key_hash; idempotent; counts only in the log) and exits before any start-up sealing, so hub 0.137.0 can run on the database again. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS