fix(stats): map protocol mileage fields

go/vehicle-gateway/internal/realtime/kv.go

@@ -30,7 +30,6 @@ func BuildFieldsEnvelope(env envelope.FrameEnvelope) (envelope.FrameEnvelope, bo
 	if !ok {
 		return envelope.FrameEnvelope{}, false
 	}
-	statFields := fieldsWithCanonicalStats(fields, env.Fields)
 	out := envelope.FrameEnvelope{
 		EventID:          env.StableEventID() + ":fields",
 		TraceID:          env.TraceID,
@@ -45,7 +44,7 @@ func BuildFieldsEnvelope(env envelope.FrameEnvelope) (envelope.FrameEnvelope, bo
 		SourceEndpoint:   env.SourceEndpoint,
 		EventTimeMS:      env.EventTimeMS,
 		ReceivedAtMS:     env.ReceivedAtMS,
-		Fields:           statFields,
+		Fields:           fields,
 		ParsedFields:     fields,
 		ParsedFieldTypes: fieldTypes,
 		Parsed: map[string]any{
@@ -57,22 +56,6 @@ func BuildFieldsEnvelope(env envelope.FrameEnvelope) (envelope.FrameEnvelope, bo
 	return out, true
 }
 
-func fieldsWithCanonicalStats(mapped map[string]any, canonical map[string]any) map[string]any {
-	out := cloneAnyMap(mapped)
-	for _, key := range []string{
-		envelope.FieldTotalMileageKM,
-		envelope.FieldSpeedKMH,
-		envelope.FieldSOCPercent,
-		envelope.FieldLongitude,
-		envelope.FieldLatitude,
-	} {
-		if value, ok := canonical[key]; ok && value != nil {
-			out[key] = value
-		}
-	}
-	return out
-}
-
 func EnsureParsedFields(env *envelope.FrameEnvelope) bool {
 	if env == nil {
 		return false