Remove the app-server README and its contributor guidance references (#43421)

## What changed

Delete `codex-rs/app-server/README.md` and remove references to it from `AGENTS.md`, while retaining the requirement to update app-server docs and examples when API behavior changes.

GitOrigin-RevId: 664f38c4939a9784b1241225e5101b97ec4ae9e6
This commit is contained in:
jif
2026-09-07 10:11:33 +00:00
committed by copyberry
parent b04ed4c50c
commit d3ee328ee6
2 changed files with 1 additions and 3060 deletions
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