Interface: MediaStashEntry
Per-entry shape stored in a Media's stash register.
Remarks
Each entry carries its own trust tier so render code can route derived text (OCR, captions, transcripts) through its own envelope independent of the parent media. How a battery or middleware assigns those entry-level tiers is the implementor's call — the primitive contract does not enforce a "downgrade derived interpretation from possibly-adversarial bytes" policy.