s3-presigned-secret-is-class-level

Status: IN

`_SECRET` is generated once per class load (`uuid4().hex`), not per instance, so all `ObjectStorage` instances in the same process share the same HMAC signing key.

Source: entries/2026/06/05/s3-object-storage-s3_object_storage.md

Depended on by

• data-isolation-gaps-parallel-access-control-gaps

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