* fix(ghe-copilot): route OpenAI-native models via Responses API
- Add targetFormat: 'openai-responses' to gpt-5.4-mini, gpt-5.3-codex, gpt-5-mini,
mai-code-1-flash, and oswe-vscode-prime in ghe-copilot registry.
- Register gpt-5.6-sol, gpt-5.6-terra, and gpt-5.6-luna with openai-responses targetFormat.
- Update GheCopilotExecutor.buildUrl() to route openai-responses and codex models to
<gheUrl>/responses while keeping Claude and Gemini on /chat/completions.
- Add unit tests verifying targetFormat parity and buildUrl endpoint routing.
* docs(changelog): add fragment for #8835
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
---------
Co-authored-by: Alex <sefias_methue@hotmail.de>
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
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