Persist freshly-staged hot ops and immediately retire them into durable history. Appends each hot frame (so a crash before retirement still recovers the work), then retires up to the last staged timestamp, which drains exactly these ops and re-snapshots the registry. Returns the retired `Rev`s. A no-op when nothing was staged.
(&mut self, hot_ops: &[HotOp], interaction_end: bool)
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