Three new tests in tests/hermes_cli/test_proxy.py:
- xai_adapter_retry_rotates_pool_entry_on_429 — headline #28932 case.
Two-entry pool, 429 on first entry, must rotate to second entry
AND must NOT call refresh_xai_oauth_pure (refresh is irrelevant
for rate limits).
- xai_adapter_retry_returns_none_on_429_when_pool_exhausted —
single-entry pool: 429 returns None so the rate-limit response
flows back to the client unchanged (existing behavior preserved).
- xai_adapter_retry_returns_none_for_unrelated_status — non-{401,
429} statuses must not trigger any retry path at all; guards
against the gate becoming too broad in future changes.
Each test asserts that refresh_xai_oauth_pure is never called on the
429 path — refresh is a 401-specific concern.
39/39 in tests/hermes_cli/test_proxy.py.
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