2b96f9f569
This PR does the following: - divides user msgs into 3 categories: plain, user instructions, and environment context - Centralizes adding user instructions and environment context to a degree - Improve the integration testing Building on top of #3123 Specifically this [comment](https://github.com/openai/codex/pull/3123#discussion_r2319885089). We need to send the user message while ignoring the User Instructions and Environment Context we attach.