Adds missing robot imports

[kellyguo11]

Description

Adds a couple of robots that were missing from the init.py imports

Fixes #3881

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Overview

Greptile Summary

Added missing imports for three robot modules (agibot, agility, and cassie) to the __init__.py file, making their robot configurations (AGIBOT_A2D_CFG, DIGIT_V4_CFG, and CASSIE_CFG) accessible via direct import from isaaclab_assets.robots.

• Added from .agibot import * to expose AGIBOT_A2D_CFG
• Added from .agility import * to expose DIGIT_V4_CFG and related constants
• Added from .cassie import * to expose CASSIE_CFG
• All imports maintain alphabetical ordering consistent with existing pattern

The fix resolves issue #3881 where users were unable to import these robot configurations directly from the package.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk - it only adds missing module imports
• The change is straightforward and low-risk: three wildcard imports were added to expose existing robot configuration modules that were already present in the codebase. The imports follow the existing alphabetical pattern, the referenced modules exist and contain valid exports, and the change directly resolves the reported issue without modifying any logic or functionality.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
source/isaaclab_assets/isaaclab_assets/robots/init.py	5/5	Added missing imports for agibot, agility, and cassie robot modules in alphabetical order

Sequence Diagram

sequenceDiagram
    participant User
    participant __init__.py
    participant agibot
    participant agility
    participant cassie
    
    User->>__init__.py: Import robot configs
    __init__.py->>agibot: from .agibot import *
    agibot-->>__init__.py: AGIBOT_A2D_CFG
    __init__.py->>agility: from .agility import *
    agility-->>__init__.py: DIGIT_V4_CFG, LEG_JOINT_NAMES, ARM_JOINT_NAMES
    __init__.py->>cassie: from .cassie import *
    cassie-->>__init__.py: CASSIE_CFG
    __init__.py-->>User: All robot configs available

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