v0.80.0 - Native vStorage Object Deletion

• SDK storage.ObjectClient.DeleteObject and CLI storage delete-object
  delete one current object name. The CLI requires --yes; every read-only
  setting refuses before S3 credentials load.
• Each invocation sends one unconditional DELETE. HTTP 204 confirms acceptance,
  without proving prior existence, permanent erasure, or reclaimed quota.
  Concurrent writers remain unprotected, and versioning can retain data or add
  a delete marker. No version selector, precondition, retry, or cleanup is added.
• Ambiguous results return ErrObjectDeleteUnconfirmed and CLI
  ObjectDeleteUnconfirmed with exit 1. Inspect the current key and version
  history before another deletion. Failed metadata output after confirmed
  success reports completion and never resends.
• Explicit S3 region and private credentials-file flags, safe metadata output,
  and the five-minute default timeout remain. No new live verification is
  claimed. Native copy is a separate release; move/rename remains gated.
  See object guidance.