test_xllm_cuda_kernels.py — 7 test groups:
1. activation.cu: silu_and_mul via ixf_F, compare vs torch.nn.functional.silu
2. norm.cu: rms_norm + fused_add_rms_norm via ixf_F, compare vs PyTorch
3. rope.cu: rotary_embedding via ixf_F, verify rotation applied
4. moe_topk_softmax: corex .so, verify shapes + weights sum to 1
5. ix_moe_bridge: full 7-step fused MoE pipeline (topk→expand→gemm→act→gemm→combine)
6. ix_attn_bridge: load test (prefill_attention, decode_attention, linear)
7. ix_full_bridge: silu_and_mul + rms_norm through bridge .so
Revert: undo unnecessary cccl_upstream sync (already up to date)
Run on real machine: python3 qwen3_6_scripts/test_xllm_cuda_kernels.py
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