[breaking] Groq retires qwen/qwen3-32b and meta-llama/llama-4-scout-17b-16e-instruct

Groq shuts down qwen/qwen3-32b, meta-llama/llama-4-scout-17b-16e-instruct on GroqCloud effective 2026-07-17. Users were notified by email on 2026-06-17. Recommended replacement: openai/gpt-oss-120b. Effective: 2026-07-17. Migration target: groq/openai/gpt-oss-120b. Affected: groq/qwen/qwen3-32b, groq/meta-llama/llama-4-scout-17b-16e-instruct. Severity: breaking. Verification: verified.