[TEST] Jax MAPPO System Integration

[mmorris44]

What do you want to test?

Jax MAPPO full integration test

Outline of test structure

• Unit tests (if possible)
• Test component interactions
• Ensure not crashing during standard executor and trainer steps

Definition of done

Passing checks, cover all basic component interactions, edge cases considered

Mandatory checklist before making a PR

• [ ] The success criteria laid down in “Definition of done” are met.
• [ ] Test code is documented - docstrings for methods and classes, static types for arguments.
• [ ] Documentation is updated - README, CONTRIBUTING, or other documentation.