Usage: switch reasnor examples to vLLM

#48
by xuanli1 - opened

Replace the native cosmos-framework Reasoner example with the release-tested vLLM serving flow.

Changes:

  • Add vLLM container and single-GPU serving instructions.
  • Replace the offline Reasoner CLI with an OpenAI-compatible image reasoning example.
  • Keep the displayed result on default inference; thinking is enabled by default.
  • Document the supported OpenAI client extra_body setting for a no-think response.
  • Send the local example image as a data URL so the client works with a containerized server.

Compatibility:

  • README-only change confined to the Reasoning region.
  • Verified to merge cleanly alongside discussion #46, which updates only the Generation region.
  • Python example syntax and git diff --check pass.
  • The default example was executed successfully against the latest vllm/vllm-openai:cosmos3 image and latest model weights.
Ready to merge
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