feat: 新增 slope_r2_idm 和 slope_r2_ensemble 动量因子

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- slope_r2_idm: slope_r2 × IDM(信息离散动量)，惩罚靠少数大涨日撑起来的假动量
- slope_r2_ensemble: 多窗口(63/126/252天) slope_r2 等权融合，捕捉不同周期趋势信号
- 新增 info_dispersal_momentum() 计算正收益天数占比
- 新增 slope_r2_idm_score() 和 slope_r2_ensemble_score() 因子函数
- ensemble 因子需要更长预加载窗口(504天)和计算窗口(252天)
- crash filter 仍使用原始 n_days 窗口

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aszerW

2026-06-12 12:37:29 +08:00

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commit 8c3ae2269a

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