Add built-in simulation reset: Model.reset_state() + viewer R key#2468

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vidurv-nvidia wants to merge 7 commits intonewton-physics:mainfrom

vidurv-nvidia:vidurv/viewer-reset-button

Commits on Apr 15, 2026

Add Model.reset_state() for in-place state reset

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Export reset_state at package level

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Add ViewerBase reset signal API

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Add R key shortcut and Reset button to ViewerGL

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Use viewer reset signal in example run loop with lightweight path

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Remove unused imports in test_viewer_reset

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Address review: extended buffers, test rigor, request_reset API

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