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45d38bc4b2
Real OpenAI-compatible upstreams with stream_options.include_usage=true
send finish_reason in one chunk (usage: null) and the actual token counts
in a separate, trailing usage-only chunk (choices: [], usage: {...}).
Both the live translator (openai-responses.ts) and the legacy transformer
(responsesTransformer.ts) fired response.completed as soon as they saw
finish_reason, so the trailing usage chunk's token counts were captured
into state but never emitted -- Codex CLI and other /v1/responses
consumers saw response.completed with no usage field (permanent 0%
context-used).
Both translators now defer response.completed via an
awaitingTrailingUsage state flag when finish_reason arrives without
usage already captured, and complete on the next usage-only chunk (or
at stream end via the existing flush fallback) instead. Extracted the
duplicated events/emit boilerplate into a new
openai-responses/eventEmitter.ts leaf to keep the frozen
openai-responses.ts file under its file-size baseline.
Fixes 3 existing tests that encoded the old chunk ordering and adds a
permanent regression test (tests/unit/responses-usage-trailing-6906.ts)
covering both translators.