[Question] Plan for an Inverse Kinematics (IK) glTF Extension

Is there any plan or ongoing discussion to introduce an extension for inverse kinematics (IK) in glTF? Has anyone in the community expressed interest or started similar work?

## Reason
Many 3D modeling tools provide IK editing features. If the joint connections and joint constraints could be exported directly for runtime use, it would greatly simplify workflows and improve interoperability. This proposal is not about a specific IK algorithm—the runtime could choose any implementation—but about standardizing the description of IK chains and constraints in glTF.

Any information, references, or suggestions would be appreciated. Thank you!

The issue names no files or tests. Begin by reviewing existing glTF extension discussions and related IK work, then determine whether there is enough community interest to pursue standardizing IK chains and constraints; done would be a documented direction or decision.

Written by the indexing model from the issue text.