- Added comprehensive documentation with 5 safety rules and best practices - Added atomic.Bool closed field for lifecycle tracking - Added IsClosed() method to check storage state - All existing tests pass with -race flag Amp-Thread-ID: https://ampcode.com/threads/T-e10b5206-4acd-4b9c-915d-423f958e350b Co-authored-by: Amp <amp@ampcode.com>