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parse_csindex_announce.py 3 处修复: - 932000 launch xlsx header 定位"证券代码"列(原 row[0]=指数代码 bug, distinct=1) - 000852 列表搜索用 indexCode payload 精准拉(28 -> 96 公告, 回溯到 2016) - akshare current snapshot header 定位"成分券代码"列(原 iloc[0]=日期 bug, current=0) migrate_constituent.py: - 加 _read_announce_union_aggregated(): 000852/932000 用 announce_union 全集 替换原 snapshot-only 路径, was_removed 治幸存者偏差 - 缺 announce_union 时回退旧 snapshot 逻辑(向后兼容) TDD: tests/portfolio/test_migrate_announce_union.py 7 测全过(5 unit + 2 integration) Mac 产出验证: - 000852: distinct 1220 -> 1672, was_removed 0 -> 672 - 932000: distinct 1 -> 2684(launch 修复), was_removed 0 -> 684