Code cleanup and deduplication pass through weatherfeeder

internal/normalizers/openweather/register.go

@@ -5,12 +5,11 @@ import (
 	fknormalize "gitea.maximumdirect.net/ejr/feedkit/processors/normalize"
 )
 
+var builtins = []fknormalize.Normalizer{
+	ObservationNormalizer{},
+}
+
 // Register appends OpenWeather normalizers in stable order.
 func Register(in []fknormalize.Normalizer) []fknormalize.Normalizer {
-	out := in
-
-	// Observations
-	out = append(out, ObservationNormalizer{})
-
-	return out
+	return append(in, builtins...)
 }