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* fix(combo): detect empty content_block in streaming SSE peek (port from 9router#1382) The bounded SSE peek in validateResponseQuality() treated ANY content_block_start/delta/stop event as proof of real output and stopped buffering immediately, without checking whether the block actually carried text/tool_use content. Some upstreams (reported: DeepSeek, GLM via claude→openai translation) can open and close a text content_block with empty text and no tool_use on tool-heavy requests — the gateway logged success and forwarded a client-visible empty completion, and combo routing never failed over to the next model. Track real content separately from 'a content_block_* event was seen': a tool_use/redacted_thinking block start is self-evidently real signal, a text/thinking block start is not (real content only confirmed via a subsequent delta carrying non-empty text/thinking, or an input_json_delta streaming tool arguments). A completed lifecycle (message_start + message_delta/stop) that never produced real content now fails validateResponseQuality(), matching the existing content_filter empty-stream detection path (#3685). Reported-by: heishen6 (https://github.com/decolua/9router/issues/1382) * refactor(combo): extract SSE lifecycle applier to keep the complexity ratchets at baseline The #1382 empty-content_block peek added a branchy switch inline in parseAccumulatedSse, pushing check:complexity to 2057 > baseline 2056. Move the switch to a module-level applySseLifecycleEvent() and hold the four lifecycle booleans in a single SseLifecycleFlags object threaded through it, so the closure no longer copies flags in and out per event. The per-event predicates (content_block_start / content_block_delta / message_delta) are split into small guard helpers, which keeps the applier flat — cognitive complexity punishes nesting, and an earlier switch-only extraction traded the cyclomatic ratchet for a cognitive regression at 891 > 890. Logic is unchanged; both ratchets are now green (complexity 2055, cognitive-complexity 890) and the #1382 regression tests still pass.