feat(fusion): A4 bf16 grouped-MoE gate+up+SwiGLU → shared vt::MoeGrou… #1317

Job	Run time
documentation-checkpoint	11s
build-test-cpu	14m 21s
device-leakage	13s
cuda-arch-features	11s
agent-record	12s
commit-protocol-tag	10s
sanitize-cpu (address,undefined)	18m 25s
sanitize-cpu (thread)	20m 22s
	54m 5s

Provide feedback