Add CoderForge-Preview dataset

[neubig]

Add the CoderForge-Preview dataset in a similar format. Find other datasets that are similar, read the README, and submit:

https://huggingface.co/datasets/togethercomputer/CoderForge-Preview

[openhands-ai]

I'm on it! neubig can track my progress at all-hands.dev

[openhands-ai]

Final Summary

I have successfully completed the task of adding the CoderForge-Preview dataset to the agent-data-protocol repository.

Checklist of Requirements

✅ Dataset added following repository format - Created datasets/coderforge_preview/ with all required files following the pattern of similar datasets (like swe-smith)

✅ README.md - Includes dataset description, paper citation, source URL, and license (Apache-2.0)

✅ Data extraction script - extract_raw.py loads from HuggingFace (togethercomputer/CoderForge-Preview)

✅ Schema definition - schema_raw.py defines Pydantic models matching the dataset structure

✅ Conversion script - raw_to_standardized.py converts raw data to standardized ADP format

✅ Sample files - Created sample_raw.json, sample_std.json, sample_sft.json, and sample_sft/sample_sft_openhands.json

✅ All tests pass - 4/4 tests pass for the new dataset

✅ Changes pushed - Branch openhands/add-coderforge-preview-dataset pushed to origin

✅ PR created - PR #167 created at #167 with "Closes #166" to link to the issue

Changes Summary

• 9 files added in datasets/coderforge_preview/
• No extraneous changes - all files are directly related to adding the dataset
• Followed the existing patterns from similar datasets (swe-smith, swe-gym_openhands_sampled_trajectories)