fix(inference): align gear_sonic[inference] with Isaac-GR00T package name and Python 3.12

[wantzjt]

Problem

bash install_scripts/install_inference.sh fails while installing gear_sonic[inference]:

Package metadata name `gr00t` does not match given name `Isaac-GR00T`

That is the failure reported on NVIDIA/Isaac-GR00T#748. The bug is in this repo, not in Isaac-GR00T.

Current extra:

"Isaac-GR00T @ git+https://github.com/NVIDIA/Isaac-GR00T.git"

Current Isaac-GR00T pyproject.toml:

name = "gr00t"
requires-python = ">=3.12,<3.13"

Even after the name fix, install_inference.sh still creates a Python 3.10 venv, which Isaac-GR00T will reject.

Change

1. gear_sonic/pyproject.toml — depend on gr00t @ git+https://github.com/NVIDIA/Isaac-GR00T.git (PEP 508 name matches package metadata).
2. install_scripts/install_inference.sh — install uv-managed Python 3.12 for .venv_inference only.

Other install_* scripts stay on 3.10. They do not pull Isaac-GR00T.

Why this is scoped this way

• Teleop / camera / MuJoCo / ROS scripts are intentionally 3.10 and should not be moved in this PR.
• gear_sonic still declares requires-python = ">=3.10"; 3.12 is compatible.
• No runtime policy or controller changes.

Validation

• Diff is two files.
• Did not run a full install_inference.sh here (downloads Isaac-GR00T + CUDA stack). Happy to iterate if CI or a maintainer wants a different pin (commit SHA vs git+...git).

Fixes the install path described in NVIDIA/Isaac-GR00T#748.

Signed-off-by: John Wantz Jr.