dsh-code-impact v0.2.0

TS/JS 变更影响分析 V2：支持 JSONC、extends、project references、jsconfig、路径别名、package exports/imports，并为影响结果提供传播原因链。新增变更测试候选、稳定排序、警告严重级别、截断统计和约 3,000 文件性能测试。\n\nValidated locally with typecheck, 21 tests, build, and npm pack dry-run. npm publication is pending npm authentication.