Fixes #5777.

Root cause

• Hermes now adds Anthropic thinking / output_config kwargs when reasoning is enabled.
• Older anthropic SDKs do not accept those kwargs.
• hermes update can update the repo without reinstalling Python deps, so an older SDK can still be in the existing env.
• That turns into Messages.create() got an unexpected keyword argument 'thinking' before the request even reaches MiniMax.

What changed

• Added a small SDK compatibility check against anthropic.resources.messages.Messages.create.
• If the installed SDK does not support thinking, Hermes now skips reasoning kwargs instead of crashing.
• If thinking is supported but output_config is not, Hermes sends adaptive thinking without output_config.
• Added regression tests for both cases.

Repro / verification

• Reproduced locally with a project-local .venv311 using anthropic==0.39.0.
• Before fix: kwargs included thinking, and a Messages.create(...)-style call raised the same TypeError.
• After fix: kwargs omit thinking/output_config, and the same call shape succeeds.

Checks

• python -m pytest -o addopts='' tests/test_anthropic_adapter.py -q -k 'reasoning_config or reasoning_disabled or sdk_lacks_thinking or adaptive_thinking_omits_output_config'
• python -m py_compile agent/anthropic_adapter.py tests/test_anthropic_adapter.py