fix: garmin MLR routing byte, ultrahuman decode copy, dead battery check

lib/src/control.dart

@@ -430,7 +430,7 @@ class Gen5HelloInfo {
     final batteryRaw = u32(body, 1) ~/ 10;
     return Gen5HelloInfo(
       helloRevision: body[0],
-      batteryPct: (batteryRaw >= 0 && batteryRaw <= 100) ? batteryRaw : null,
+      batteryPct: batteryRaw <= 100 ? batteryRaw : null,
       charging: (body[5] & 0x01) != 0,
       tsSeconds: u32(body, 6),
       tsSubseconds: u32(body, 10),

lib/src/garmin.dart

@@ -124,7 +124,7 @@ GarminMlrPacket? garminDecodeMlr(List<int> data) {
   if (data.isEmpty) return null;
   if ((data[0] & _kMlrFlag) != 0) {
     final handle = (data[0] & _kMlrHandleMask) >> _kMlrHandleShift;
-    return GarminMlrData(handle, Uint8List.fromList(data));
+    return GarminMlrData(handle, Uint8List.fromList(data.sublist(1)));
   }
   if (data[0] != 0) return null;
   if (data.length < 2) return null;

lib/src/ultrahuman.dart

@@ -187,7 +187,7 @@ const int kUltrahumanMeasureNotOnFinger = 100;
 /// `offset + 32 > bytes.length` — a truncated record, never guessed at.
 UltrahumanRecord? parseUltrahumanRecord(List<int> bytes, int offset) {
   if (offset < 0 || offset + kUltrahumanRecordLen > bytes.length) return null;
-  final b = Uint8List.fromList(bytes);
+  final b = bytes is Uint8List ? bytes : Uint8List.fromList(bytes);
   final d = b.buffer.asByteData(b.offsetInBytes + offset);
   return UltrahumanRecord(
     tsA: d.getUint32(0, Endian.little),

test/garmin_test.dart

@@ -114,6 +114,7 @@ void main() {
       final decoded = garminDecodeMlr([0x80 | (2 << 4), 1, 2, 3]);
       expect(decoded, isA<GarminMlrData>());
       expect((decoded as GarminMlrData).handle, 2);
+      expect(decoded.payload, [1, 2, 3], reason: 'routing byte 0 must be stripped');
     });
 
     test('a non-flagged, non-zero first byte is rejected, not a data frame',