Add paper: LoopArena

Hi, I’d like to suggest adding the following paper to Awesome Code LLM.

**LoopArena: Benchmarking Models as Runtime Controllers for Loop Engineering**

GitHub: https://github.com/AMAP-ML/LoopArena
Paper: https://huggingface.co/papers/2608.28281
ModelScope mirror: https://www.modelscope.cn/papers/2608.28281

Suggested placement: **Datasets → Benchmarks → Integrated Benchmarks**, although I’m happy to follow the maintainers’ preferred classification.

Disclosure: I’m one of the authors.

Locate the repository section corresponding to Datasets → Benchmarks → Integrated Benchmarks and review the surrounding entry format. Add the LoopArena paper with its GitHub, paper, and ModelScope links, then verify the placement and Markdown formatting match neighboring entries.

Written by the indexing model from the issue text.