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geotiff: extract read_vrt and VRT dask helpers into _backends/vrt.py (#1813 step 9) #1887
Description
Reason
read_vrt (xrspatial/geotiff/__init__.py L3814) and its two dask helpers _vrt_chunk_read / _read_vrt_chunked (L4069, L4121) form the VRT read backend, about 350 lines together. The XML parsing already lives in _vrt.py; this PR moves only the orchestration that picks among eager / dask / GPU paths.
Proposal
Move them to xrspatial/geotiff/_backends/vrt.py. Re-export read_vrt from __init__.py. open_geotiff's .vrt routing becomes from ._backends.vrt import read_vrt. The #1813 parity matrix backstops the move.
Refs: #1813.
Activity
geotiff: extract read_vrt and VRT dask helpers to _backends/vrt.py (#…
geotiff: extract writers to _writers/, reduce __init__.py to dispatch (…