chore: organize solution into module folders (Core/Server/Drivers/Client/Tooling)

Group all 69 projects into category subfolders under src/ and tests/ so the
Rider Solution Explorer mirrors the module structure. Folders: Core, Server,
Drivers (with a nested Driver CLIs subfolder), Client, Tooling.

- Move every project folder on disk with git mv (history preserved as renames).
- Recompute relative paths in 57 .csproj files: cross-category ProjectReferences,
  the lib/ HintPath+None refs in Driver.Historian.Wonderware, and the external
  mxaccessgw refs in Driver.Galaxy and its test project.
- Rebuild ZB.MOM.WW.OtOpcUa.slnx with nested solution folders.
- Re-prefix project paths in functional scripts (e2e, compliance, smoke SQL,
  integration, install).

Build green (0 errors); unit tests pass. Docs left for a separate pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.Tests/AbCipStatusMapperTests.cs

@@ -0,0 +1,41 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Driver.AbCip;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.Tests;
+
+[Trait("Category", "Unit")]
+public sealed class AbCipStatusMapperTests
+{
+    [Theory]
+    [InlineData((byte)0x00, AbCipStatusMapper.Good)]
+    [InlineData((byte)0x04, AbCipStatusMapper.BadNodeIdUnknown)]
+    [InlineData((byte)0x05, AbCipStatusMapper.BadNodeIdUnknown)]
+    [InlineData((byte)0x06, AbCipStatusMapper.GoodMoreData)]
+    [InlineData((byte)0x08, AbCipStatusMapper.BadNotSupported)]
+    [InlineData((byte)0x0A, AbCipStatusMapper.BadOutOfRange)]
+    [InlineData((byte)0x13, AbCipStatusMapper.BadOutOfRange)]
+    [InlineData((byte)0x0B, AbCipStatusMapper.Good)]
+    [InlineData((byte)0x0E, AbCipStatusMapper.BadNotWritable)]
+    [InlineData((byte)0x10, AbCipStatusMapper.BadDeviceFailure)]
+    [InlineData((byte)0x16, AbCipStatusMapper.BadNodeIdUnknown)]
+    [InlineData((byte)0xFF, AbCipStatusMapper.BadInternalError)]
+    public void MapCipGeneralStatus_maps_known_codes(byte status, uint expected)
+    {
+        AbCipStatusMapper.MapCipGeneralStatus(status).ShouldBe(expected);
+    }
+
+    [Theory]
+    [InlineData(0, AbCipStatusMapper.Good)]
+    [InlineData(1, AbCipStatusMapper.GoodMoreData)] // PLCTAG_STATUS_PENDING
+    [InlineData(-5, AbCipStatusMapper.BadTimeout)]
+    [InlineData(-7, AbCipStatusMapper.BadCommunicationError)]
+    [InlineData(-14, AbCipStatusMapper.BadNodeIdUnknown)]
+    [InlineData(-16, AbCipStatusMapper.BadNotWritable)]
+    [InlineData(-17, AbCipStatusMapper.BadOutOfRange)]
+    [InlineData(-99, AbCipStatusMapper.BadCommunicationError)] // unknown negative → generic comms failure
+    public void MapLibplctagStatus_maps_known_codes(int status, uint expected)
+    {
+        AbCipStatusMapper.MapLibplctagStatus(status).ShouldBe(expected);
+    }
+}