transform_process_response_sheet should warn or detect space_on_x mismatch with plotting calls

[madsCodeBuddy]

Context. transform_process_response_sheet bakes ellipse polygon coords into x_coords / y_coords columns by calling create_ellipse_data. The orientation of those coords depends on the space_on_x argument. Downstream, add_processes (which calls _render_glyph) plots them positionally without re-checking.

Bug shape. If a caller passes space_on_x=False to add_processes but called transform_process_response_sheet without the matching argument (default True), the ellipses render with swapped x/y silently. The two halves of the API don't enforce or communicate the convention they share.

Reproduced in the merged leverage-points HTML before #22 fixed the calling site.

Possible fixes (in increasing order of API change):

1. Document the contract. Add a docstring note to transform_process_response_sheet and add_processes that space_on_x must match across the pipeline. (Cheapest; doesn't prevent the bug.)
2. Stamp orientation as metadata. Have transform_process_response_sheet add a column like _coord_orientation ("stommel" or "boyd"). Have add_processes raise if the orientation doesn't match its space_on_x argument.
3. Regenerate at render time. Have _render_glyph ignore x_coords / y_coords and call create_ellipse_data itself with the right space_on_x. Trades cache benefit for correctness.

Lean toward (2) — keeps the precomputed-coords benefit while making the failure mode loud.