[breaking] Cohere retires the Embed v2.0 family and Aya Expanse/Vision 8B

Effective April 4, 2026, Cohere retired the embed-english/light/multilingual v2.0 models and the c4ai-aya-expanse-8b and c4ai-aya-vision-8b models. Recommended migrations: embed-v3.0/embed-v4.0 for embeddings, command-r7b-12-2024/command-a-03-2025/command-a-reasoning-08-2025 for chat. The page does not date the announcement; announced_at reflects the effective date, the only date the source provides. Effective: 2026-04-04. Affected: cohere/embed-english-v2.0, cohere/embed-english-light-v2.0, cohere/embed-multilingual-v2.0, cohere/c4ai-aya-expanse-8b, cohere/c4ai-aya-vision-8b. Severity: breaking. Verification: verified.