Update Blackwell CuTeDSL helpers for Rubin compatibility

[xiufanl]

Summary

• Update the public Blackwell CuTeDSL helper examples required by the Rubin and cute_ext examples published for the 4.8 DSL wheel.
• Keep the change focused on the four compatibility gaps reported by NvBugs 6675927, 6676409, 6676454, and 6676300.

Fix

• Publish the missing helpers/cli_helper.py module used by the public cute_ext examples.
• Publish the generated 4.8 Blackwell grouped-GEMM, blockscaled grouped-GEMM, and persistent dense-GEMM examples from the authoritative DKG cutlass_ir/compiler/python sources.
• Restore the use_cached_problem_shapes grouped scheduler contract and the dense scheduler's swizzle/raster propagation expected by Rubin subclasses.

Testing

• Python bytecode compilation of the four changed files and affected Rubin consumers
• Static AST contract checks for the grouped constructors and dense grid interface
• git diff --check
• DVS 1000193594 confirmed PR head 8f82106e and exposed stale source copies; rerun required for corrected head 2d375f51

Created by dkg-ai-bugfix agent.