fix: keep lazy runtime state out of DataArray attrs#66
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Avoid storing the lazycogs backend and DuckDB client in xarray attrs so DataArray.copy(), sortby(), and downstream write paths can deep-copy metadata without trying to pickle live runtime objects. Recover the backend for lazycogs.explain() from the lazy backing array instead, and preserve explain behavior for sliced and reordered arrays.
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Avoid storing the lazycogs backend and DuckDB client in xarray attrs so DataArray.copy(), sortby(), and downstream write paths can deep-copy metadata without trying to pickle live runtime objects.
Recover the backend for lazycogs.explain() from the lazy backing array instead, and preserve explain behavior for sliced and reordered arrays.
resolves #65
resolves #64