maRefine.cc: report post-refinement element quality (diagnostic only)

[como2099]

This PR adds diagnostic-only reporting of element quality after mesh refinement when verbose output is enabled.

What this does

• After refine(), uses existing markBadQuality() / unMarkBadQuality() infrastructure to count low-quality simplex elements (triangles or tets).
• Reports the count and threshold (goodQuality) in verbose mode only.
• No change to refinement behavior or adaptation decisions.

Why this is useful

When adapting mixed 2D tri/quad meshes, refinement can create degenerate triangles. This change makes that behavior visible using existing quality metrics, without modifying the adaptation algorithm.

Scope

• One file (ma/maRefine.cc)
• No new flags
• No behavior changes
• MPI-safe and reuses existing PUMI mechanisms

Example Output

MeshAdapt: iteration 0
MeshAdapt: after refine: 75 triangles with quality < goodQuality (0.200000)
MeshAdapt: iteration 1
MeshAdapt: after refine: 1065 triangles with quality < goodQuality (0.200000)

This is intended as the first step in a sequence of small PRs to improve refinement robustness for 2D mixed-element meshes.

Related context: discussion in issue #195