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`validateResponseQuality()` only inspected a response's top-level `error` field when `choices` was also missing/empty (the narrower #3424 case), so a masked HTTP 200 that echoed a non-empty stub `choices` alongside a structured error object — or a known exhaustion phrase like "insufficient credits" / "quota exceeded" in the error envelope — slipped through as valid, and a `priority` combo kept hammering the exhausted target instead of failing over. The check now inspects the error envelope (top-level `error` object, or a bounded exhaustion-phrase match against error.message/code/type and top-level message/detail) unconditionally, before any shape-specific branch — never against `choices[].message.content`, so legitimate completions that merely mention "quota" in prose are not misclassified. Regression guard: tests/unit/masked-200-exhaustion-fallback-6427.test.ts