v0.29.0

v0.29.0 Highlights This release features 594 commits from 277 contributors (91 new)! Model Runner V2 is now the default for all models ( #53183 ), completing the rollout that began with pooling models ( #48290 ). MRV2 also gained CUDA graph memory profiling for KV cache auto-sizing ( #53306 ), batch-sharded sampling that cuts per-step logits memory by 1/TP ( #50465 ), prompt embeds ( #42963 ), extract_hidden_states speculation ( #49811 ), padded FULL cudagraph dispatch for uniform decode under spec decode ( #53407 ), and DP-sync skipping before EAGLE/MTP draft prefill ( #53694 ). MRV1 remains in use for a few ROCm models and features MRV2 doe