refactor(recipes): fold the GLM-5.2 GB300 SGLang AgentX point recipes into bundles

#3659 split the GB300 GLM-5.2 SGLang AgentX recipes into one file per point. Like
the other AgentX families, the three aggregate points select overrides of
agg-variants.yaml and the three low-latency 1PxD points overrides of
disagg-variants.yaml; each override selects exactly its old recipe. The
DEP8/DEP16 2P1D point is a different design and keeps its own file.

Author: adibarra