Add configurable report module composition

internal/briefing/base_modules_test.go

@@ -174,6 +174,26 @@ func TestAreaForecastDiscussionAndWeatherStoryModules(t *testing.T) {
 	}
 }
 
+func TestAreaForecastDiscussionModuleCanSelectSections(t *testing.T) {
+	registry := MustDefaultModuleRegistry()
+	ctx := testModuleContext()
+
+	output, err := registry.BuildModule(ctx, module.ConfigItem{
+		ID:      module.AreaForecastDiscussion,
+		Options: module.AreaForecastDiscussionOptions{Sections: []string{"short_term"}},
+	})
+	if err != nil {
+		t.Fatalf("BuildModule() error = %v", err)
+	}
+	afd := moduleValue[AreaForecastDiscussionModule](t, output)
+	if afd.ShortTerm != "Showers increase this afternoon." {
+		t.Fatalf("ShortTerm = %q, want selected short term section", afd.ShortTerm)
+	}
+	if afd.Product != "" || len(afd.KeyMessages) != 0 || afd.LongTerm != "" {
+		t.Fatalf("AFD = %#v, want only short_term section", afd)
+	}
+}
+
 func testModuleContext() ModuleContext {
 	generatedAt := mustParseModuleTime("2026-05-29T08:00:00-05:00")
 	definition := report.DefaultRegistry().MustLookup(report.DailyToday)