[BUG] Incorrect GeomType enum value and missing return types/docstrings in MeshGenerator

[sankalps0549]

Describe the bug
The GeomType enum includes a DUAL_DOMAIN value("Dual Domain"), which is not valid. It should use FUSION ("Fusion") instead.
Reference: GeomType definition — specifically line 411

In addition, the MeshGenerator class is missing return type annotations and has incomplete docstrings for the following methods:

• generate
• save_options

Expected behavior

• GeomType should include FUSION as a valid enum value instead of DUAL_DOMAIN.
• MeshGenerator.generate() and MeshGenerator.save_options() should specify return types and have complete docstrings.

Environment:

• OS: Windows 11
• Python: 3.10.11
• Package Version: 26.0.3
• Moldflow Synergy Version: 2026.1