GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
LoadPackage( "ActionsForCAP" ); LoadPackage( "LinearAlgebraForCAP" ); Q := HomalgFieldOfRationals( ); category := MatrixCategory( Q ); u := TensorUnit( category ); a := VectorSpaceObject( 2, Q ); structure_morphism := VectorSpaceMorphism( TensorProductOnObjects( u, a ), HomalgMatrix( [ [ 0, 1 ], [ -1, 0 ] ], 2, 2, Q ), a ); act_a := LeftActionObject( structure_morphism, u ); coact_a := RightCoactionObject( (-1) * RightUnitorInverse( a ), u ); mor_1 := ActionMorphism( act_a, IdentityMorphism( a ), act_a );