[breaking] Azure AI Foundry retires tsuzumi-7b on 2026-08-31

Azure AI Foundry lists tsuzumi-7b (2) as legacy with retirement on 2026-08-31; suggested replacement: tsuzumi2. Azure retirement dates are platform-specific and may differ from the model provider's own schedule. The page does not date the announcements; announced_at reflects the page capture date. Effective: 2026-08-31. Migration target: microsoft/tsuzumi2. Affected: microsoft/tsuzumi-7b-2. Severity: breaking. Verification: verified.