Test/stable provider contracts

[Noaman-Akhtar]

Summary

This PR establishes the first automated test foundation for Sugar-AI’s provider layer and request-validation logic.

Included

• Configure Pytest test discovery and strict marker validation.
• Add requirements-dev.txt for development-only test dependencies.
• Test GenerationParams defaults and temperature-controlled sampling.
• Test provider factory selection and configuration forwarding for Hugging Face, Ollama, Gemini, and OpenAI-compatible providers.
• Test OpenAI-compatible aliases, invalid provider names, and missing cloud API keys.
• Test generation-parameter mapping for OpenAI-compatible, Ollama, and Gemini APIs.
• Test Gemini chat-message conversion and response-text extraction.
• Test BaseProvider interface helpers.
• Test Hugging Face output cleanup and chat-message normalization.
• Test PromptedLLMRequest defaults, numeric boundaries, and nested ChatMessage conversion.

Verification

.\venv\Scripts\python.exe -m pytest tests -q -p no:cacheprovider

[Noaman-Akhtar]

@mebinthattil , @chimosky can you please review this ?

[mebinthattil]

Since this is the first test suite this repo's ever had, I'd say it makes sense to add a minimal .github/workflows/ci.yml that runs pytest on PRs.

Musicblocks already has one if you want a reference.

[Noaman-Akhtar]

@mebinthattil I have added the github workflow for running the tests . please review it at your convenience .