Desktop never ingests CLI agent draft-create broadcasts (kind 24200 observer frames)

[BrianInAz]

Bug: buzz agents draft-create publishes a kind-24200 observer frame (ephemeral), the relay accepts it, but the Desktop never receives/renders it — no owner-review form ever appears.

Verified working (backend):

• NIP-OA auth tags valid; agent→owner binding present in the relay users.agent_owner_pubkey
• Frame carries the owner p tag; owner identity on the Desktop matches; broadcast accepted by the relay ({"accepted":true})
• CLI WSS was fixed to rustls-tls-native-roots (fix(cli): use rustls native roots for WSS #17) — TLS/connectivity is not the issue

Verified broken (Desktop 0.5.3 canary @ cb6afa8):

• Zero kind-24200 frames ever archived (agents/retention* untouched since Jul 30; no session logs after restart; no unified-log traces)
• Draft→dialog wiring exists: AgentManagementDialogs renders AgentDefinitionDialog on management.request?.action === "create", useAgentObserverIngestion mounted in AppShell — but nothing ever arrives to trigger it
• The Desktop's observer subscription ("DB subscription" repaired by useObserverArchiveReconciliation on internal builds) appears not active in this canary

Impact: remote agent adoption (CLI draft-create → owner review in Desktop) is dead in the canary; the Desktop's own create-agent form always mints a new keypair, so existing identities (e.g. Hermes bot identities) cannot be registered as managed agents.

Repro: mint a valid NIP-OA auth tag for any identity, run buzz agents draft-create (ephemeral kind-24200 frame with owner p tag), observe no Desktop receipt.