[codex] add DM metadata poisoning PoC#3305
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Adds a focused PoC test for the forged DM channel metadata issue reviewed against PR #3263.
The test demonstrates that a non-admin member can submit forged deterministic DM metadata with roleName=member, have validateEntry accept it, and cause future messages sent through that channel record to be encrypted to the broad member role. It then verifies another member outside the intended DM can decrypt the resulting message.
Validation run locally with Node 20.20.1: