Fix API release changelog link Committed-By-Agent: codex Co-authored-by: codex <noreply@openai.com>
Sync migration guide with source Committed-By-Agent: codex Co-authored-by: codex <noreply@openai.com>
Add migration guide for v16 Committed-By-Agent: codex Co-authored-by: codex <noreply@openai.com>