ArenaMatrix not exposed to Python

[pierfabre]

Bug description

The ArenaMatrix type is not exposed to Python.

Reproduction steps

Code

import aligator

...

problem = aligator.TrajOptProblem(space.neutral(), stages, term_cost)
solver = aligator.SolverProxDDP(tol, mu_init, verbose=aligator.VERBOSE)
solver.setup(problem)
solver.run(problem)

first_stage = solver.workspace.lqr_problem.stages[0]
A = first_stage.A

Error

TypeError: No Python class registered for C++ class aligator::ArenaMatrix<Eigen::Matrix<double, -1, -1, 0, -1, -1>, 16>

System

• OS: Ubuntu 24.04.3
• aligator version: 0.17.1