MiMo's /anthropic endpoint enforces the same strict thinking-history contract as Kimi and DeepSeek: assistant tool-call turns must carry reasoning_content back or the API returns HTTP 400.

• Add _is_xiaomi_mimo_endpoint() to anthropic_adapter.py
• Include MiMo in _preserve_unsigned_thinking condition
• Add _needs_xiaomi_tool_reasoning() to run_agent.py
• Add regression test for MiMo thinking replay

What does this PR do?

Related Issue

Fixes #

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)

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Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
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• I've run pytest tests/ -q and all tests pass
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• I've tested on my platform:

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
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• I've updated tool descriptions/schemas if I changed tool behavior — or N/A

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