[breaking] Amazon Bedrock retires Marengo Embed v2.7 (EOL 2026-11-30)

Amazon Bedrock moves TwelveLabs Marengo Embed v2.7 to Legacy on 2026-05-29 with end-of-life on 2026-11-30 (public extended access from 2026-08-29, at provider-set pricing). Bedrock lifecycle dates are platform-specific and may differ from the model provider's own schedule. announced_at reflects the documented Legacy date, when Bedrock notifies users. Effective: 2026-11-30. Affected: amazon/twelvelabs.marengo-embed-2-7-v1:0. Severity: breaking. Verification: verified.