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Chan/research/out/step43_fill_budget.csv
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jackandCursor 28075173af 出场模型改为按成交量结算止盈限价单，并出预算对仓位规模的曲线 
exit_model.walk_exits 给止盈记的毛收益是 target*a/entry，即假定限价单全额
成交在目标价。新增 lib/exit_fill.py：两张挂单常驻（半仓 3ATR、半仓 8ATR），
每根按该根在限价之上的可成交量逐步吃进，未成交部分继续持有，止损触发时
市价平掉剩余。可成交量 = 形状函数 f(k) × 该根主动买成交额，f 由影子成交流
实测（近似线性，即区间内均匀分布，故结论对形状假设不敏感）。

结果：预算对仓位规模远比预期稳健。到 100 万名义额，BTC 10.97→10.69、
ETH 15.34→15.20、SOL 17.21→15.83bp。原因是挂单常驻多根而非只在首次触及
那一根成交，且价格决定性穿过限价时整根成交量都可用。

首版实现有个静默 bug 值得记：avail_above 里有个 `hi <= 0` 的守卫，而空头
用「价格取负」处理，负价格空间里 hi 恒为负——所有空头挂单的可成交量一律
判 0，空头全被拖到 48 根超时收盘。下跌段里那比 3ATR 目标赚得多，于是预算
反而偏高 0.76bp，表现为「一个看似合理的模型差异」。已改为显式方向参数，
并加 assert_converges：仓位趋近 0 时必须逐笔收敛到 walk_exits，不符即抛错。

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-08-28 02:39:47 +08:00

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