Add daily planning module

internal/module/module_test.go

@@ -100,3 +100,11 @@ func TestSPCConvectiveModuleContractsAreStable(t *testing.T) {
 	_ = SPCConvectiveOutlooksOptions{}
 	_ = SPCConvectiveDiscussionOptions{}
 }
+
+func TestDailyPlanningModuleContractIsStable(t *testing.T) {
+	if DailyPlanning != ID("daily_planning") {
+		t.Fatalf("DailyPlanning = %q, want stable module ID", DailyPlanning)
+	}
+
+	_ = DailyPlanningOptions{}
+}