Add/tetheria module

[laleth-tetheria]

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[Copilot]

Pull Request Overview

Adds a new git submodule "tetheria_pregen1" to the robohive/simhive directory, linking to the TetherIA assets repository.

• Introduces a new submodule pointing to the TetherIA assets repository
• Configures the submodule to track the main branch

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
robohive/simhive/tetheria_pregen1	Adds the submodule commit reference
.gitmodules	Configures the new tetheria_pregen1 submodule with repository URL and branch

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