[v0.1]Test and Release: More ExtProc test coverage

[rootfs]

Acceptance:

• Ginkgo test suite for ExtProc components (request/response handling, model selection)
• Integration tests for model-specific reasoning (GPT OSS/Qwen3/DeepSeek template kwargs)
• Config validation tests (model paths, thresholds, cache settings)

[samzong]

Hi, @rootfs this issue already finished or someone working now?

[uestcergs7]

/assign