Say only a refusal as a plan's hold, not a tier's summary left in its note (issue 920, review round 1)

cmd/mesh-controller/plan_clock_test.go

@@ -109,3 +109,19 @@ func TestAPlanLineSaysTheRefusalOnceItsTierIsBuilt(t *testing.T) {
 		t.Errorf("920/AC2: a plan with a tier module not built reads %q", line)
 	}
 }
+
+// 920/AC3: a tier move writes the previous tier's summary into the note; with the new tier all built, the line still
+// says "building for", for that note is no refusal.
+func TestAPlanLineDoesNotHoldOnATiersSummary(t *testing.T) {
+	now := time.Date(2026, 10, 21, 19, 0, 0, 0, time.UTC)
+	built := now.Add(-time.Hour)
+	for _, note := range []string{"failed or refused its send (apply-failing says it): novox", "tier 0 built; sent mesh-sdk to novox first, in one send"} {
+		p := inventory.Plan{ID: "plan-s", Repository: "novox/mesh-sdk", Commit: "b2f5ebb2", State: inventory.PlanBuilding,
+			Tier: 1, Created: now.Add(-2 * time.Hour), Updated: now, TierEntered: now.Add(-time.Hour), Note: note,
+			Tiers:   [][]string{{"a"}, {"b"}},
+			Modules: map[string]*inventory.PlanModule{"a": {State: "built", BuiltAt: &built}, "b": {State: "built", BuiltAt: &built}}}
+		if line := planLine(p, now); !strings.Contains(line, "building for 1h0m0s") || strings.Contains(line, "held") {
+			t.Errorf("920/AC3: a plan with the note %q reads %q", note, line)
+		}
+	}
+}