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Root cause: waitForImageViaWebSocket() only parsed the singular
update_content.message (object) / payload.message / data.message shapes
in the celsius WebSocket frames chatgpt.com uses to deliver async
image_gen results. Some chatgpt.com deployments deliver the completed
tool-role image_asset_pointer message inside update_content.messages[]
(a plural array of { message: {...} } wrappers) instead, which produced
zero candidates, so the listener idled out the timeout and the request
failed with the generic 'ChatGPT Web completed without returning image
markdown' 502 with no x_image_resolution_failed flag.
Fix: also read update_content.messages[] and push each wrapped message
into the same candidate pipeline used for the singular shape.
Regression test: tests/unit/chatgpt-web-async-image-ws-shapes-7357.test.ts
drives the real ChatGptWebExecutor.execute() end-to-end (real SSE
parsing, real pollForAsyncImage()/waitForImageViaWebSocket()), mocking
only the network edges (tlsFetchChatGpt + global WebSocket), and proves
the plural-array frame now resolves to image markdown instead of being
dropped.
Gates run: check-file-size (OK), check-complexity (OK, 2054 <= 2056
baseline), check-cognitive-complexity (OK, 889 <= 890 baseline),
typecheck:core (clean), eslint on changed files (clean), full
tests/unit/chatgpt-web.test.ts (89/89), chatgpt-web-image-silentdrop.test.ts,
chatgpt-web-tools-5240.test.ts, chatgpt-web-models-split.test.ts,
chatgpt-web-sha3-boringssl-5531.test.ts, chatgpt-web-handoff-resume.test.ts,
chatgpt-web-citations(-escape).test.ts all pass.