* feat(auth): add Copilot login
Add experimental GitHub Copilot device login and copilot/* provider support for users with Copilot access but no OpenAI account.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* fix(copilot): use responses for GPT-5
Route Copilot GPT-5 models through the Responses API because gpt-5.5 is not available on /chat/completions.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* fix(copilot): honor device flow timing
* docs(copilot): add auth helper docstrings
* fix(auth): address copilot review feedback
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Nuno do Carmo