[breaking] Google schedules gemini-2.5-flash-image shutdown for October 2, 2026

The Gemini deprecations schedule lists gemini-2.5-flash-image (released October 2, 2025) for earliest shutdown October 2, 2026, replaced by gemini-3.1-flash-image-preview. The changelog carries no dated announcement; announced_at reflects the capture date. Effective: 2026-10-02. Migration target: google/gemini-3.1-flash-image-preview. Affected: google/gemini-2.5-flash-image. Severity: breaking. Verification: verified.