Provisioner asks the backend, not memory, whether a consumer is still there

An optional holds() on the adapter is asked for every applied consumer
every minute; false applies it again. A backend that forgets what it was
given while the provisioner runs (hq issue 120) is healed within a
minute instead of failing its consumers in silence. Unable to ask is not
treated as loss. Adapters without holds() behave as before.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@novox/mesh-sdk",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "The stable spine a Novox Mesh module's own code builds against.",
   "type": "module",
   "exports": {