agentHost: Adapt SDK download notification to available models - #334672

PR classified as team-member.

✅ Head commit 5867b9e is signed by TylerLeonhardt with trusted key 5EB73315BD2DAA0A83AB380C85AF6EEE1A51B1E0 — approval requirement reduced from 2 to 1.

⚠️ Collaborator approvals: 0/1.

Needs 1 more collaborator approval to merge.

✅ No newly added runnable binary files.

✅ No protected engineering system files changed.