chore(repo): 瘦身规范 - 忽略编译产物/JIT缓存/raw_outputs，取消跟踪618个垃圾文件
- .gitignore 新增规范：实验目录只提交 代码 + report.md + results.json(小体量汇总)
- 忽略: *.o/*.so/*.ninja*/*.cubin, sglang_sm120_cache/, vllm_sm120_cache/,
*_sm120_cache/, experiments/**/runtime/, bench-output/, experiments/**/raw_outputs/
- 修正原 experiments/*/runtime/ 规则过窄(只匹配一层) -> experiments/**/runtime/
- git rm --cached 取消跟踪 618 个已入库的缓存/产物/原始日志(文件保留在本地工作区)
- 当前 HEAD 减少约 83MB 跟踪体积; 历史体积需另做 filter-branch 重写(本次不做)
- results.json 保留(28个共0.99MB, compare.py/文档依赖)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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