The deployer was blindly calling Namespaces().Create() which triggered
cluster-scope RBAC checks even when the namespace already existed.
Now checks with Get() first and only creates if NotFound.
Also adds namespace get/create and secrets create/update/patch
permissions to the rdev-api-deployer ClusterRole.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>