Decides, per requested subscription, whether this host may run it (03 §11): host type, row status, driver
availability, capability gating through core's SubscriptionUnsupportedReason, and handler registration. Runs on
every reconcile, so it never constructs a handler.
Decides, per requested subscription, whether this host may run it (03 §11): host type, row status, driver availability, capability gating through core's SubscriptionUnsupportedReason, and handler registration. Runs on every reconcile, so it never constructs a handler.