feat(rbac,cli): RoleBinding typed nullable FKs + credential bind subc… #1624

Job	Run time
detect-changes	9s
API Server Integration Tests	2m 4s
CLI Build and Tests	1m 18s
Frontend Unit Tests (Vitest)	0s
Ambient Runner Tests	0s
Script Tests (model-discovery)	0s
Backend Unit Tests	0s
summary	2s
	3m 33s

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