Merge pull request #485 from iiasa/project/ssp/transport/2026-03-11

Adjust `.ssp.transport`

Author: khaeru

doc/whatsnew.rst

@@ -16,6 +16,7 @@ Next release
   - Add :func:`.buildings.build.prepare_data_B`;
     rename :py:`prepare_data()` to :func:`~.buildings.build.prepare_data_A`.
 
+- Adjust :mod:`.project.ssp.transport` (:pull:`485`):
 - Add stub of :func:`.scenariomip.workflow.generate` (:pull:`394`).
 
 v2026.4.17