Replace wildcard imports with explicit imports in utils and markers

[anandheritage]

This PR replaces wildcard imports (from module import *) with explicit named imports in the utils and markers modules, following PEP 8 guidelines to improve code clarity and maintainability.

PEP 8 Guidance on Wildcard Imports

From PEP 8 - Imports:

"Wildcard imports (from <module> import *) should be avoided, as they make it unclear which names are present in the namespace, confusing both readers and many automated tools."

[greptile-apps]

Greptile Overview

Greptile Summary

This PR attempts to replace wildcard imports (from module import *) with explicit named imports in the utils and markers modules, following PEP 8 guidelines. However, it contains a critical error:

Critical Issue Found:
The utils module attempts to import four non-existent functions from the mesh submodule:

• convert_mesh_to_meshio_mesh
• make_convex_mesh_from_mesh
• make_mesh_from_geometry
• merge_meshes

These functions are not defined in mesh.py and have never existed in the codebase. The mesh module's __all__ list actually exports only: create_trimesh_from_geom_mesh, create_trimesh_from_geom_shape, convert_faces_to_triangles, and PRIMITIVE_MESH_TYPES.

Positive Notes:

• The markers module replacement is correct - all imported symbols exist and are properly defined
• The approach of listing explicit imports is correct and follows PEP 8
• All other utils module imports appear to be valid (array, buffers, configclass, dict, interpolation, logger, modifiers, string, timer, types, version)

The PR needs to be corrected to import the actual functions exported from the mesh module.

Confidence Score: 0/5

• This PR is NOT safe to merge - it will cause an ImportError at runtime due to non-existent imports from the mesh module.
• The PR introduces a critical syntax/import error that will prevent the utils module from being imported. The four functions being imported from mesh.py do not exist in that module, and this will break any code that tries to import from isaaclab.utils. While the approach and markers changes are correct, this single critical error makes the entire PR non-functional.
• source/isaaclab/isaaclab/utils/init.py requires immediate correction - must replace the non-existent mesh function imports with the actual exports from mesh.py

Important Files Changed

File Analysis

Filename	Score	Overview
source/isaaclab/isaaclab/utils/init.py	0/5	Contains critical import errors - attempts to import 4 non-existent functions from mesh module (convert_mesh_to_meshio_mesh, make_convex_mesh_from_mesh, make_mesh_from_geometry, merge_meshes). This will cause an ImportError at runtime. The PR introduces non-existent symbols that break the utils module import.
source/isaaclab/isaaclab/markers/init.py	5/5	Correctly replaces wildcard imports with explicit imports. All marker configuration imports and VisualizationMarkers classes are properly listed and exist in the source modules.

Sequence Diagram

sequenceDiagram
    participant User as User Code
    participant UtilsInit as utils/__init__.py
    participant MeshMod as mesh.py
    participant MarkersInit as markers/__init__.py
    participant ConfigMod as config/__init__.py
    
    User->>UtilsInit: import isaaclab.utils
    UtilsInit->>MeshMod: from .mesh import convert_mesh_to_meshio_mesh, ...
    MeshMod-->>UtilsInit: ❌ ImportError - functions don't exist
    
    Note over UtilsInit: Correct imports should be:<br/>from .mesh import create_trimesh_from_geom_mesh, ...<br/>(4 existing functions from __all__)
    
    User->>MarkersInit: import isaaclab.markers
    MarkersInit->>ConfigMod: from .config import BLUE_ARROW_X_MARKER_CFG, ...
    ConfigMod-->>MarkersInit: ✓ Success - all 11 configs exist
    MarkersInit->>User: ✓ Success

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[anandheritage]

@Mayankm96

This is my first PR - Landed here after while reading a research paper. Will like to contribute to this community.
Thanks !