Particle rendering prototype - #6685
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Prime MPM points before asynchronous GPU updates and bind cloned render products to per-environment cameras. Expand Franka Pour rendering coverage and add Newton renderer golden images.
paths already identify each visual instance. Align tests and backend stubs with the exercised API surface.
Franka pour training could warn or crash because task configuration resolution imported pxr before SimulationApp launched. The eager MDP exports loaded runtime action implementations through Articulation and the USD cloner. Split action configuration from runtime implementations, use resolvable class strings, and lazily export MDP symbols so config construction remains Kit-free.
Adapt coupled and standalone Implicit MPM reset masks to the solver's world-mask contract, and skip unsupported selective shared-world resets. Add regression tests and changelog fragments.
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DO NOT MERGE. THIS IS TO TEST PARTICLE INTEGRATION.
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pre-commitchecks with./isaaclab.sh --formatconfig/extension.tomlfileCONTRIBUTORS.mdor my name already exists there