M3 R3.2: AddHistoricalValuesAsync supports Double + Int (Int2/Int4/UInt4)

Extended the historical-write serializer from Float-only to all five analog types EnsureTagAsync
supports. Captured each type's "ON" buffer live from the native client (sandbox tag per type,
written + captured + deleted):

- The 4-byte value descriptor (C0 10 01 00) is CONSTANT across types — it does not encode the type.
- The value is u32(0) + native-width value, width by the tag's declared type:
  Float->float32, Double->double64, Int2->int16, Int4->int32, UInt4->uint32.

HistorianHistoricalWriteProtocol.SerializeAddStreamValuesBuffer now takes the HistorianDataType and
encodes accordingly (unsupported types throw ProtocolEvidenceMissingException). The orchestrator
resolves the type from the tag-info NativeDataTypeDescriptor via MapDataType. Harness capture-write
gained --data-type. Golden-tested against all five live captures + the gated write/read-back test
validated each type end-to-end through the pure-managed SDK; 281 unit tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC

tests/AVEVA.Historian.Client.Tests/HistorianGrpcIntegrationTests.cs

@@ -189,9 +189,10 @@ public sealed class HistorianGrpcIntegrationTests
 
         HistorianClient client = new(BuildOptions(host));
 
-        // A backfill sample at a fixed historical second, with a distinctive value.
+        // A backfill sample at a fixed historical second, with a distinctive whole-number value so
+        // it round-trips for any analog tag type (Float/Double/Int2/Int4/UInt4).
         DateTime stamp = new DateTime(DateTime.UtcNow.Year, 1, 2, 3, 4, 5, DateTimeKind.Utc);
-        const double expected = 222.5;
+        const double expected = 7777;
         bool wrote = await client.AddHistoricalValuesAsync(
             sandboxTag!,
             [new HistorianHistoricalValue(stamp, expected)],