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## Problem When Gemini Flash returns a safety-filtered response (finish_reason: content_filter, empty content), isEmptyContentResponse() misclassifies it as a fake-success empty response and returns HTTP 502. This triggers the combo fallback chain and account cooldown escalation (5s → 10s → 20s → 40s), even though the response is a legitimate terminal state. ## Root cause errorClassifier.ts line 14: LEGIT_EMPTY_OPENAI_FINISH only exempts "length" and "tool_calls". The "content_filter" finish reason (mapped from Gemini's SAFETY/PROHIBITED_CONTENT) is not exempted, so safety-filtered responses are treated as empty content failures. ## Fix Add "content_filter" to LEGIT_EMPTY_OPENAI_FINISH so safety-filtered responses pass through as valid (though filtered) completions. ## Testing - 10/10 unit tests pass (empty-content-stopreason-3572.test.ts) including 2 new content_filter test cases - E2E: hot-patched OmniRoute v3.8.48 on X500, verified the previously failing prompt (4.6KB review) now returns valid content instead of empty-content 502 Signed-off-by: Minxi Hou <houminxi@gmail.com>