Shared try/except import block meant that if any one status function was
missing, all providers lost their OAuth fallback suppression. Split into
per-provider try/except so each branch is independently safe.
Add end-to-end test for xAI: bad XAI_API_KEY with healthy OAuth does not
surface a blocking issue in run_doctor output. Add tests for None return,
import failure isolation (xAI missing does not break Gemini), and move
test_returns_false_for_unknown_provider out of the xAI-specific class.
EloquentBrush0x
e10bb9dffa