Delete the controller's plan machinery: plans, batches, merge window, tiers, gate, retry and healers H1 and H2 (release 6, issue 1945 B7)

cmd/mesh-controller/bus_step.go

@@ -229,7 +229,7 @@ func busCommand(ctx context.Context, args []string) error {
 	fmt.Printf("bus upgrade %d: %s %s → %s on %s; streams snapshotted at %s; %s\n", step.ID, b.module, step.From,
 		short(b.to), strings.Join(moving, ", "), where, map[bool]string{true: "reversible: putting the old build back undoes it",
 			false: "NOT reversible: the snapshot is the only way back"}[*reversible])
-	sent, err := sendRollout(withBusStep(withScope(ctx, sendScope{person: true})), open, moving)
+	sent, err := sendToEach(withBusStep(ctx), open, moving)
 	if err != nil {
 		_ = inv.EndBusStep(ctx, step.ID, "failed", "the send was refused: "+err.Error())
 		return fmt.Errorf("the bus's machine could not be sent its new build: %w — nothing was replaced", err)