v0.20.0

SQL Sage 0.20.0 - models now follow the CLIs installed on your machine: the Codex channel reads Codex's own local model catalog, so model retirements (such as GPT-5.5 on Oct 14) are handled without an extension update; a clear 'update Codex CLI' message instead of an error when a newer model needs it; never switches you to a costlier model on its own. New 'Recommended' row in the model picker, reasoning effort shown for Codex, inline completions choose their model automatically. Audit records now name the exact model that acted. Hardened validation of model names passed to the CLIs.