What does this PR do?

Supports MiniMax auxiliary providers that authenticate with oauth_minimax by resolving runtime OAuth credentials instead of treating them as unsupported non-API-key providers.

Related Issue

Fixes #21521

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

• update agent/auxiliary_client.py so resolve_provider_client() accepts oauth_minimax
• resolve MiniMax OAuth credentials via resolve_minimax_oauth_runtime_credentials() instead of the generic API-key helper
• add a regression test in tests/agent/test_auxiliary_client.py covering the MiniMax OAuth path

How to Test

1. uv run --frozen --extra dev pytest -q -o addopts='' tests/agent/test_auxiliary_client.py -k minimax_oauth
2. uv run --frozen ruff check agent/auxiliary_client.py tests/agent/test_auxiliary_client.py
3. confirm resolve_provider_client("minimax-oauth") builds the OpenAI-compatible client with the OAuth-derived token and base URL

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes (required for bug fixes, strongly encouraged for features)
• I've tested on my platform: macOS 15.5

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings) — or N/A
• I've updated cli-config.yaml.example if I added/changed config keys — or N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows — or N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide — or N/A
• I've updated tool descriptions/schemas if I changed tool behavior — or N/A

Screenshots / Logs

• targeted pytest: 1 passed, 154 deselected
• ruff check passed