mesh-self-check: DA judges each machine's agent account on its engine's own report, so the probe moves off the controller with its kind, key and words (issue 1952, ADR 0266)

The agent account a machine names comes from placement; the engine's verdicts on it from its health report
(mesh-host.health, NodeHealth.Root and Contract); whether that verdict is on now from the watchman's presence, since
the report is written on a change only. The judgement is the controller's: no report, not heard, an engine older than
the judging, no verdict, or any verdict not healthy is not confined; a verdict waiting for the setuid search is quiet
for twelve hours from when this self-check first saw it waiting. machine.<node>.agent-root, urgent, the controller's
words. Rows in TestTheBusProbes; pins mesh-sdk f3677eb.

modules/mesh-self-check/module.json

@@ -21,7 +21,8 @@
   "reads": [
     "mesh-delivery-assigner.placement",
     "mesh-delivery-assigner.seat-holders",
-    "mesh-delivery-watchman.presence"
+    "mesh-delivery-watchman.presence",
+    "mesh-host.health"
   ],
   "state": [
     "findings",