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v1beta does not support newer models like gemini-3-flash, causing silent 404 errors that back up the observation queue indefinitely. Users with CLAUDE_MEM_GEMINI_MODEL=gemini-3-flash get zero observations stored, with no visible error — the queue just grows silently. Changes: - Switch API URL from v1beta/models to v1/models (generateContent works identically on both endpoints) - Add gemini-3-flash to GeminiModel type and RPM limits - Update test to match new endpoint Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>