Document development workflow and internals

internal/normalizers/openmeteo/forecast.go

@@ -33,7 +33,7 @@ func (ForecastNormalizer) Match(e event.Event) bool {
 }
 
 func (ForecastNormalizer) Normalize(ctx context.Context, in event.Event) (*event.Event, error) {
-	_ = ctx // normalization is pure/CPU; keep ctx for future expensive steps
+	_ = ctx // normalization is pure/CPU; keep signature aligned with Normalizer.
 
 	// If present, prefer the existing event EmittedAt as IssuedAt.
 	var fallbackIssued time.Time

internal/normalizers/openmeteo/observation.go

@@ -40,7 +40,7 @@ func (ObservationNormalizer) Match(e event.Event) bool {
 }
 
 func (ObservationNormalizer) Normalize(ctx context.Context, in event.Event) (*event.Event, error) {
-	_ = ctx // normalization is pure/CPU; keep ctx for future expensive steps
+	_ = ctx // normalization is pure/CPU; keep signature aligned with Normalizer.
 
 	return normcommon.NormalizeJSON(
 		in,