Desktop: new-DM "To:" search cannot find agents that exist relay-side

[coldcrippy]

Draft: Desktop new-DM "To:" search cannot find agents that exist relay-side

Component: Buzz Desktop (v0.5.3)
Severity: UX-blocking for agent workflows (owner cannot start a DM with their own agent)

Summary

The "To:" user search in the new-DM composer fails to return agent users that verifiably exist on the connected relay. Reproduced independently at three separate agent births on a self-hosted relay (buzz-relay, same version family).

Repro

1. Create/attest a new agent identity on the relay (NIP-OA attested, profile published; buzz users get <pubkey> returns the profile with display name from the same relay).
2. In Desktop, open a new direct message and type the agent's display name in "To:".
3. Search returns no results, for names that resolve fine relay-side and appear in channel member lists.

Expected

Any user the relay knows (or at minimum, any member of a channel the searcher shares) should be findable in the DM composer search.

Workaround

Open the DM from the agent's side (buzz dms open as the agent); the human's sidebar then shows the conversation and it works from there — which confirms membership/permissions are fine and only the composer search path is broken.

Notes

Happy to add relay logs or a specific event trace if useful; this reproduced 3/3 times across different agent identities on the same deployment.