Add Codex App model catalog support (#1297)

Add ChatGPT OAuth as an OpenAI Codex provider (#1279)

Make provider model discovery the sole catalog owner (#1221)

Add searchable model selection to the Admin UI (#1121)

Canonicalize provider failure and retry ownership (#1046)

Introduce a typed application boundary for provider execution (#1045)

Replace global runtime resources with explicit ownership (#1042)

Establish single-owner runtime with stream-safe provider hot swaps (#1036)