issue 1841/S11: judge the upgrades' health from the runs, rounds and held kernels on the bus, so a node that slept through a run is judged by what happened, not by a unit's age (folds issue 1579)

modules/pacman/cmd/pacman-tools/main.go

@@ -236,13 +236,11 @@ func tools(m *Machine) []stdio.Tool {
 		},
 		{
 			Name: "pacman_upgrade_health",
-			Description: "Whether the weekly full upgrade (Saturday 04:00 local time, ADR 0477) last passed, as the module's health check: unhealthy " +
-				"with the exit and the last error of the journal when it failed, healthy while it runs, after it passed and before it ever ran. (r)",
+			Description: "This node's upgrades, read from the bus, as the module's health check (ADR 0508 §11): unhealthy while no upgrade-order " +
+				"is set, while the node's latest run is refused, failed or did not pass its after-upgrade check, hung past two hours, or held a " +
+				"kernel, and while the week's round stands still at this node or at the node it waits for, naming it and since when. (r)",
 			Input: schema(map[string]any{}),
 			Run: func(map[string]any) (any, error) {
-				if h, said := m.InstalledHealth(); said {
-					return h, nil
-				}
 				return m.UpgradeHealth(), nil
 			},
 		},