Force-mapping rewrites streaming OpenAI Responses SSE through StreamRewriter before the /v1/responses websocket forwarder. Antigravity/Gemini and Codex emit frames without reliable trailing newlines, so buffered chunks glued as ...}event:..., ...}data:..., or event:/data: without separators. The rewriter dropped pending tails and downstream WS synthesized 408 without response.completed even when upstream returned HTTP 200.
- safeReplaceGlued for }event: and }data: when data JSON is complete\n- Finish flush with glue normalization and line-wise fallback\n- Newline between pending event: and next data: line (Codex scanner lines)\n- Regression tests: Antigravity sim, Codex data lines, force-map WS forward
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