Add mesh_interlibrary_formatter package with adapters and scale-calibrate CLI

[Krane1130]

Motivation

• Provide a canonical, lightweight mesh representation and toolset to interoperate between common Python mesh libraries (PyVista, trimesh, PyMeshLab, Open3D, Blender).
• Supply a minimal end-to-end CLI for uniform scale calibration to support downstream pipelines and reproducible preprocessing.

Description

• Add mesh_interlibrary_formatter.core.MeshData dataclass with validation, utilities (copy, bounds, centroid, apply_scale, summary) and point-cloud/triangle-mesh helpers.
• Implement adapter modules adapters/pyvista_adapter.py, adapters/trimesh_adapter.py, adapters/pymeshlab_adapter.py, adapters/open3d_adapter.py, and adapters/bpy_adapter.py to convert to/from MeshData and provide load_with_* and to_* helpers.
• Provide a thin CLI mesh_interlibrary_formatter.cli.scale_calibrate which loads a mesh via trimesh adapter, applies a uniform scale, and writes the result; add package __init__.py exports and update README.md to document the package and CLI behavior.

Testing

• Ran the test discovery command python -m unittest discover -s tests -p "test_*.py" -v, which executed the regression suite including tests/test_phase4_regressions.py and reported success.

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Codex Task