## Why
Now that basic cross-OS app/exec support is wired up, it's time to clean
up the tech debt of the remote_env_windows test and make sure its test
logic is covered in more maintainable feature-specific tests.
## What
- Add focused app-server tests for target-native `AGENTS.md` sources and
content, plus shell and cwd context, while preserving explicit TODO
baselines for the remaining host-scoped metadata.
- Add a `TestAppServer` helper that waits for and returns the matching
typed turn completion.
- Remove redundant app-server coverage and dependencies from
`remote_env_windows` while retaining its exec and apply-patch smoke
coverage. A follow-up will remove these.
## Validation
- `just test -p codex-app-server`
- `bazel test //codex-rs/app-server:app-server-all-wine-exec-test
--test_output=errors`
- `bazel test //codex-rs/core/tests/remote_env_windows:smoke-test
--test_output=errors`
