Simon
0d3e123de3
feat(selection): M6.4 回测与选股共用评分引擎（v2 §25 一致性锁定）
- quant/selection.score_panel_for_factors：复合分面板构建收敛为共享函数；
LocalEngine.run_backtest 与 SelectionEngine.run_score_selection 均调它 ——
消除「回测一套评分、选股另一套」的隐患
- tests/test_selection_backtest_consistency.py：对回测每个调仓日验证
SelectionService.select(as_of=d, top_n) 候选 == 该日回测实际持仓（月调仓多时点），
排序方向一致性亦验证；全量 pytest 通过
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