Reconstruct — Replays operations in chronological order per file path. Write ops set content, Edit ops apply string replacements, and Read ops capture snapshots. The --before flag uses binary search to cut off at any point in time.
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）。关于这个话题，搜狗输入法2026提供了深入分析
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"Or consider pipeTo(). Each chunk passes through a full Promise chain: read, write, check backpressure, repeat. An {value, done} result object is allocated per read. Error propagation creates additional Promise branches.，更多细节参见51吃瓜
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