Consolidation cluster 5: tile / strip decode (long-tail epic #2424) #2429

Follow-up to epic #2424 / #2390. Cluster 5 of 16. Parallel-safe.

Likely 1 PR.

Scope

Extend read/test_tiling.py with the tile / strip decoder edge cases still at the top level.

Files to consolidate (7)

• xrspatial/geotiff/tests/test_geotiff_planar_strip_truncation_1782.py
• xrspatial/geotiff/tests/test_mixed_bps.py
• xrspatial/geotiff/tests/test_mixed_sample_format.py
• xrspatial/geotiff/tests/test_parallel_decode_default_tile_1551.py
• xrspatial/geotiff/tests/test_parallel_strip_decode_2100.py
• xrspatial/geotiff/tests/test_planar_multiband.py
• xrspatial/geotiff/tests/test_unpack_bits_vectorised_1713.py

Target

Extend xrspatial/geotiff/tests/read/test_tiling.py. Parametrise by layout (tiled / stripped), planar config, bits-per-sample, sample format.

Boundary

• test_parallel_strip_decode_sparse_2100.py belongs to the IFD-parser cluster (issue Add Dask Support to Viewshed #2). Leave alone.
• GPU stripped paths belong to the GPU cluster issue.

Constraints

• Tests-only.
• Markers from _helpers/markers.py; make_minimal_tiff from _helpers/tiff_builders.py.
• Descriptive IDs.
• CLUSTER_AUDIT_TILE_STRIP.md deleted before merge.

Verification

pytest xrspatial/geotiff/tests/read/test_tiling.py -v
pytest xrspatial/geotiff/tests/ -x -q

File count drops by 7 (7 deleted, 0 added).