Justin Gu
a69fa4103a
fix: 寻优指标缓存键改内容哈希 — 修复 v1.25 起两段式加速静默失效
缓存键此前用数组对象 id 做签名，而引擎每次 run 会重建数组对象，
id 逐网格点漂移导致跨点永不命中——ParamGridOptimizer 的指标缓存
全程 0 命中，两段式加速自 v1.25 引入起就没生效过。正确性不受影响
（缓存未命中即走重算路径，结果与无缓存逐位一致），属纯性能回归；
test_optimizer_cache_reuse_across_grid_points 因此一直在失败。
- IndicatorCache._atom 数组签名由 (id, shape) 改为
(dtype, shape, blake2b 内容摘要 16 字节)：同值不同对象视为同一
数据；NaN 按字节参与哈希，位模式不同只多算一次、不会误命中
- 删除防 id 复用的 _array_refs 强引用表（内容寻址下不再需要，
缓存不再延长数组生命周期）
- 新增缓存级回归测试：同内容不同对象必须命中；原失败测试转绿
- 实测 16 点网格命中率 38%（修复前恒为 0）；全量 pytest 1613
通过、ruff/mypy 全绿
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