geotiff: orientation 5-8 on georeferenced TIFFs returns wrong coords behind a warning #1765

_apply_orientation_with_geo in xrspatial/geotiff/_reader.py (~line 2260) handles TIFF Orientation tag values 5-8 (transpose, 90 CW, transverse, 90 CCW) on georeferenced files by swapping pixel_width and pixel_height in the transform and calling warnings.warn. That swap is not enough. Orientations 5-8 require a per-orientation origin shift plus a rotation that the axis-aligned GeoTransform cannot express, so the returned x/y coords are wrong while the user only sees a warning saying "may need manual adjustment".

Returning wrong georeferenced coords behind a warning is the wrong contract for this module.

Proposed fix:

• When a file has crs_epsg or crs_wkt set and the Orientation tag is in {5, 6, 7, 8}, raise NotImplementedError with a message naming the orientation value and pointing at the workaround (reproject with another tool, or strip the Orientation tag).
• Non-georeferenced files keep the existing axis swap. No geographic claims to violate there.

Implementing the correct affine for 5-8 needs a rotation component the rest of the reader does not carry. Failing hard is the honest option.