When Gemini returns a quota exhausted error, OpenCode auto-retries and
fires session.status with type='retry'. The extractAutoRetrySignal
function requires BOTH 'retrying in' text AND a quota pattern to match,
but some providers (like Gemini) include only the error text in the
retry message without the 'retrying in' phrase.
Since status.type='retry' already confirms this is a retry event, the
fix adds a fallback check: if extractAutoRetrySignal fails, check the
message directly against RETRYABLE_ERROR_PATTERNS. This ensures quota
errors like 'exhausted your capacity' trigger the fallback chain even
when the retry message format differs from expected.
Fixes#2454
YeonGyu-Kim