Deprecate the parallel getters the context answers, and ratchet them shut (#40342)

test/registered/dcp/test_reduce_scatter_along_dim.py

@@ -25,6 +25,7 @@ import torch
 import torch.distributed as dist
 
 import sglang.srt.distributed.parallel_state as ps
+from sglang.srt.runtime_context import get_parallel
 from sglang.test.ci.ci_register import register_cuda_ci
 
 register_cuda_ci(
@@ -130,6 +131,9 @@ def init_distributed():
         local_rank=local_rank,
         backend="nccl",
     )
+    # The context answers a handle from what was stated on it, not from
+    # this module global, so a rank stood up by hand says so itself.
+    get_parallel().override_permanently(world_group=coord)
 
     cpu_group = coord.cpu_group
     nccl_group = coord.device_group