Fix adapt crash for mixed-element 2D meshes with frozen quad layers

[como2099]

This PR fixes a crash in PUMI adapt that occurs for 2D mixed-element meshes (tri + quad) when quad layers are frozen.

The issue was discovered while using PUMI with CFD workflow. In this configuration, adaptation should proceed on triangle elements even when quad layers are excluded.

The fix adds a guard in maQuality.cc to allow safe adaptation of triangles
in mixed-element 2D meshes without affecting existing workflows.

Bug originally found in release v4.1.0; tested by building against current develop and running the affected
adaptation path.

Fixes #523

[joshia5]

Thank you for the fix @como2099. The changes in the pr adds a check by computing the validity (using positive area) of a quadrilateral element. In line 586, it assumes a 2d mesh in (x,y) coordinate system, which can work fine by itself if the mesh is 2D however until we might get to putting something similar to measureQuadQuality in place in future, will you be able to modify this line 586 to check for +ve magnitude and direction of the two resultant cross products for a general coordinate system without this assumption?

[como2099]

Updated the quad validity check to be fully orientation-independent:

• Replaced the z-component area test with a cross/dot product check for general 3D
• Added a small relative tolerance to handle near-degenerate triangles and floating-point noise

This ensures consistent orientation without assuming a specific coordinate system.

[joshia5]

check for +ve magnitude and direction

[cwsmith]

/runtests

[github-actions]

Build Log
Simmetrix Test Result: success
Simmetrix + CGNS Test Result: success