feat: margin utilization summary - #16
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变更范围小且自包含，新增功能具备明确输入校验并有对应单元测试覆盖，文档/路线图同步更新一致。
Pull request overview
本 PR 增加了一个用于批量持仓模拟结果的保证金占用率统计摘要函数 margin_utilization_summary，用于在研究/回测场景下快速汇总逐笔近似的保证金占用水平，并补齐对应的单元测试与变更记录。
Changes:
- 在
goratio.margin中新增margin_utilization_summary()，基于rows[*].margin_estimate计算 mean/max utilization（相对initial_capital）。 - 新增单元测试覆盖
valid_margin_count、均值与最大占用率计算。 - 更新 CHANGELOG 与 ROADMAP，记录新 API 与测试数量变化。
File summaries
| File | Description |
|---|---|
| tests/test_margin.py | 增加 margin_utilization_summary() 的单测用例与断言。 |
| src/goratio/margin.py | 新增保证金占用率摘要函数实现与输入校验。 |
| CHANGELOG.md | 在 Unreleased 新增项中补充新函数条目。 |
| .planning/ROADMAP.md | 将新函数标记为已完成，并更新当前测试数量说明。 |
Review details
- Files reviewed: 4/4 changed files
- Comments generated: 0
- Review effort level: Lite
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新增 margin_utilization_summary，统计批量持仓保证金占用率。