`hermes doctor` displayed OAuth status for Nous, Codex, Gemini, and MiniMax
but silently omitted xAI OAuth, even though `get_xai_oauth_auth_status()`
exists and the same information is already surfaced in `hermes status`.
Add xAI OAuth as a *separate* try/except block so an import failure cannot
silence the already-printed provider rows above it — consistent with the
per-provider isolation introduced in the doctor fallback fix.
Tests:
- 9 new tests in TestDoctorXaiOAuthStatus covering: logged-in ok, not-logged-in
warn, error line present/absent, import failure isolation, runtime exception
and None-return safety.
- 9 existing run_doctor helpers updated to mock get_xai_oauth_auth_status for
deterministic output.
EloquentBrush0x
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