nCompass triton-moe experts integration
Author: IlyasMoutawwakil
Pull request: yes

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Register `nCompass-tech/triton-moe` as the "ncompass_moe" experts implementation (a bf16 GPT-OSS-style fused MoE). The kernel is wrapped in an opaque torch.library.custom_op with a register_fake so it survives torch.compile (fullgraph) — allow_in_graph is insufficient because moe_forward dereferences data_ptr under FakeTensor tracing.

Also nudge sonic-moe's load errors toward its known-good deps (apache-tvm-ffi + nvidia-cutlass-dsl==4.5.0; 4.6+ dropped ThrMma, <4.3 lacks tvm_ffi_builder), discovered while benchmarking against ncompass.

# What does this PR do?

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Fixes # (issue)

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### CI recap

**Dashboard:** [View test results in Grafana](https://transformers-ci.lor-e.huggingface.cool/d/pytest-observability-by-pr/pytest-observability-branch?var-pr=47171)
**Latest run:** [28937666512:1](https://github.com/huggingface/transformers/actions/runs/28937666512)
**Result:** `failure` | **Jobs:** 1 | **Tests:** 18 | **Failures:** 0 | **Duration:** 1m 41s

> **Code quality check failed**: test jobs were skipped. Fix the code quality issues and push again to run tests.

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