Centralize weather event and driver identifiers

internal/sources/nws/weatherstories_test.go

@@ -28,7 +28,7 @@ func TestWeatherStoriesSourcePollEmitsExpectedEventAndPrefersLatestUpdateTime(t
 	if err != nil {
 		t.Fatalf("NewWeatherStoriesSource() error = %v", err)
 	}
-	if got := src.Kinds(); len(got) != 1 || got[0] != event.Kind("weather_story") {
+	if got := src.Kinds(); len(got) != 1 || got[0] != event.Kind(standards.KindWeatherStory) {
 		t.Fatalf("Kinds() = %#v, want [weather_story]", got)
 	}
 
@@ -41,7 +41,7 @@ func TestWeatherStoriesSourcePollEmitsExpectedEventAndPrefersLatestUpdateTime(t
 	}
 
 	got := events[0]
-	if got.Kind != event.Kind("weather_story") {
+	if got.Kind != event.Kind(standards.KindWeatherStory) {
 		t.Fatalf("Kind = %q, want weather_story", got.Kind)
 	}
 	if got.Schema != standards.SchemaRawNWSWeatherStoriesV1 {
@@ -148,7 +148,7 @@ func TestWeatherStoriesSourcePollMetadataDecodeFailureStillEmitsRawEvent(t *test
 func weatherStoriesSourceConfig(url string) config.SourceConfig {
 	return config.SourceConfig{
 		Name:   "test-weatherstories-source",
-		Driver: "nws_weatherstories",
+		Driver: DriverWeatherStories,
 		Mode:   config.SourceModePoll,
 		Params: map[string]any{
 			"url":        url,