Method commit_ops

Wrap each op as a `Delta`, apply it, and chain it onto the local history. One tick per op. Operates on the *retired snapshot*: reverses are computed against and forward ops applied to it, so each `reverse` captures the true pre-op value rather than the hot-polluted working state. The working registry already reflects these ops (they were staged as hot ops before retirement, or equal the snapshot

(&mut self, ops: impl IntoIterator<Item = RegistryDelta>, idempotent: bool)