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fix: never route GitHub Copilot Gemini/Claude models to /responses (#1062) (#1536)

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GitHub Copilot's /responses endpoint only serves OpenAI (gpt/codex)
models. gemini-3.1-pro-preview was failing on /chat/completions with a
"not supported" error, getting cached as a codex model, then escalated
to /responses where it 400s with "does not support Responses API".

Add GithubExecutor.supportsResponsesEndpoint() and gate both the cached
/responses route and the 400-fallback on it, so Gemini/Claude always
stay on /chat/completions and the real upstream error surfaces.

Adds tests/unit/github-responses-routing.test.js (5 tests).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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2026-05-29 15:40:42 +07:00
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co-authored by Claude Opus 4.8
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CHANGELOG.md
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# v0.4.63 (2026-05-26)
## Fixes
- GitHub Copilot: never route Gemini/Claude models to the `/responses` endpoint; prevents misleading "does not support Responses API" 400s (#1062)
- proxyFetch: restore missing `Readable` import causing runtime `ReferenceError` in DNS-bypass fetch path
## Improvements