Use when the user wants validation to be enforced (not just advisory) on ConfigHub Units, is setting up a new Space and wants policy to apply automatically, asks about ApplyGates, says "block bad config from being deployed", "wire up schema validation", "enforce a policy", "require approval", or needs to diagnose why a Unit is blocked from applying. This skill installs the platform-Space + Filter + TriggerFilterID pattern — centralized Triggers that run on every Mutation and attach ApplyGates when validation fails. Do not load for: running validators one-off without installing them (use cub-mutate with vet-* functions instead), or for authoring the YAML itself.