Let go of a hold whose resource is no longer declared, touching nothing on disk (hq ADR 0100)

internal/apply/apply.go

@@ -202,6 +202,24 @@ func ApplyKeeping(
 		}
 	}
 
+	// **A hold whose resource is no longer declared is let go, and nothing on disk is touched.**
+	// What was found stays as it was; only the host's note that it holds it for a module goes, so
+	// the node stops reporting a hold for a module no longer assigned. Should the module come back,
+	// what is there is present with no record and is found, and held, again — its first kept
+	// original is never overwritten (novox/hq ADR 0100). Only a declaration from the mesh says
+	// what is assigned: a carried bundle's silence is not an unassignment.
+	if origin == store.OriginDeclared {
+		for _, h := range append([]store.Held{}, known.Held...) {
+			if declared[h.ID] {
+				continue
+			}
+			known.Release(h.ID)
+			report.Outcomes = append(report.Outcomes, Outcome{ID: h.ID, Type: h.Kind, Target: h.Target,
+				Action: "forgotten", Detail: "no longer declared; left as found"})
+			log(fmt.Sprintf("  forgotten %s (%s): no longer declared; left as found", h.ID, h.Target))
+		}
+	}
+
 	// What moved in this apply, so a service that must reflect a file can be told the file
 	// moved. Only within one apply: a change from an earlier one has already been reflected, and
 	// restarting for it every time would make a steady machine restart its services for ever.