/ok to test c179c3e

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MCore bump auto-fix status for release-r0.5.0:

Classification: Bridge broke itself
Evidence: On 2026-07-02, CI run https://github.com/NVIDIA-NeMo/Megatron-Bridge/actions/runs/28584202436 failed only L2_Launch_models_qwen_quantization (job https://github.com/NVIDIA-NeMo/Megatron-Bridge/actions/runs/28584202436/job/84772073239) and gb200_L2_Launch_models_qwen_quantization (job https://github.com/NVIDIA-NeMo/Megatron-Bridge/actions/runs/28584202436/job/84772073154). Both logs fail in modelopt/torch/quantization/plugins/transformer_engine.py:178 with TypeError: object of type 'bool' has no len() after MCore calls grouped linear with m_splits. The r0.5.0 base already combines TransformerEngine b9d690e042b1c4e455214e7dab65d6d3512c05d6 with nvidia-modelopt==0.44.0rc5 through merged PR #4535 from 2026-06-26. The MCore range d30c93ffae858b22eece3fa71c734c8f43161eff...458c8d0ecafdf6d9e36771600d62ade27f2a67b7 is two commits and changes only MCore's TransformerEngine dependency metadata plus uv.lock.
Fix PR: not opened. The directly relevant release fix #4615 used the same target MCore SHA, restored the ModelOpt-compatible TransformerEngine revision, and was closed unmerged on 2026-07-01. PR #4600 is open against main, has green H100 and GB200 Qwen quantization checks, but has no r0.5.0 backport label and does not itself update the release branch.
Guards: none added or removed; this is a dependency-pin compatibility issue, not a code-guard case.
Validation: PR #4627's import, unit, lint, installation, and all functional checks except the two Qwen3 MoE quantization jobs passed on 2026-07-02. No new CW interactive validation was run because no replacement fix is authorized while #4615 remains closed unmerged. Prior #4615 validation on 2026-07-01 passed uv lock --check, 81 focused unit tests, and a grouped-linear compatibility smoke test in CW interactive job 13313466.
Next action: maintainer decision needed — either authorize reopening/rebasing #4615 onto #4627, or merge #4600 and explicitly backport its dependency rollback to r0.5.0. Until that decision, do not merge #4627 because both H100 and GB200 Qwen3 MoE quantization remain red.