Desktop does not surface accepted agent draft-update requests

## Summary

`buzz agents draft-update` returns a successful, accepted owner-review request, but Buzz Desktop does not surface the prefilled edit-agent form. Repeating the request and restarting Desktop do not resolve the problem.

## Steps to reproduce

1. Have an existing personal agent.
2. From a managed Buzz agent session with a valid owner auth tag, run:

```bash
buzz agents draft-update \
--channel \
--agent-name "" \
--model ""
```

3. Observe that the CLI returns `accepted: true`, `action: "update"`, and `saved: false`.
4. Check Buzz Desktop for the prefilled owner-review form.
5. Restart Buzz Desktop and repeat the command.

## Expected behavior

Desktop receives the accepted request and opens or visibly queues the prefilled edit-agent form so the owner can review and save it.

## Actual behavior

No review form or queued draft appears in Desktop, so the update cannot be reviewed or saved.

## Additional observations

- Reproduced repeatedly with fresh requests.
- The failure persists after restarting Buzz Desktop.
- The relay acceptance path appears successful.
- The likely failure area is Desktop draft intake, delivery subscription, decryption/filtering, or UI presentation.

No request IDs, relay event IDs, channel identifiers, agent names, model choices, owner identities, or credentials are included in this public report.

Start by reproducing the accepted `buzz agents draft-update` request from a managed agent session, then follow the request through Desktop draft intake, delivery subscription, decryption or filtering, and UI presentation. Confirm where the accepted update stops being surfaced and verify that Desktop opens or visibly queues the prefilled edit-agent form for owner review.

Written by the indexing model from the issue text.