Consolidation cluster 4: coords (long-tail epic #2424) #2428

Follow-up to epic #2424 / #2390. Cluster 4 of 16. Parallel-safe.

Likely 1 PR.

Scope

Extend read/test_coords.py (already exists from #2390) with the coord-edge-case tests still at the top level.

Files to consolidate (7)

• xrspatial/geotiff/tests/test_coord_regularity_1720.py
• xrspatial/geotiff/tests/test_coords_1813.py
• xrspatial/geotiff/tests/test_coords_to_transform_3d_1643.py
• xrspatial/geotiff/tests/test_int_coord_sentinel_2087.py
• xrspatial/geotiff/tests/test_int_coords_round_trip_hotfix_1962.py
• xrspatial/geotiff/tests/test_multi_tiepoint_validation_2117.py
• xrspatial/geotiff/tests/test_rational_zero_denominator_2313.py

Target

Extend xrspatial/geotiff/tests/read/test_coords.py. Parametrise by coord shape (1D regular, 1D irregular, 3D), sentinel handling, and tiepoint mode.

Boundary

test_non_uniform_coords_alias_2215.py is also a coord-alias test; read it first and fold if it slots cleanly. Otherwise leave it for a follow-up.

Constraints

• Tests-only.
• Markers from _helpers/markers.py; make_minimal_tiff from _helpers/tiff_builders.py.
• Descriptive IDs. No issue numbers.
• CLUSTER_AUDIT_COORDS.md deleted before merge.

Verification

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

File count drops by 7 (7 deleted, 0 added since test_coords.py already exists).