Consolidate the env stub into beforeEach so the pre-existing cwd
test is also isolated from host OPENAI_API_KEY, avoiding
non-deterministic filesystem side effects.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Use vi.stubEnv to clear OPENAI_API_KEY in both new tests so they
don't silently pass the wrong branch when the key is set in the
test runner's environment.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add tests for codex_native_auth_present and codex_openai_api_key_missing
code paths. Also pass adapter-configured CODEX_HOME through to
readCodexAuthInfo so the probe respects per-adapter home directories.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
