v3(b1-twincat): apply Modbus exemplar pattern to TwinCAT (multi-device)

- Rename TwinCATEquipmentTagParser -> TwinCATTagDefinitionFactory; TryParse ->
  FromTagConfig(tagConfig, rawPath, out def). Drop leading-'{' heuristic + the
  deviceHostAddress key; def.Name = rawPath. Keep strict-enum + Inspect; add a
  Structure guard (sole tag path now) + inverse ToTagConfig.
- Options: Tags -> RawTags (RawTagEntry); keep Devices + protocol fields.
- Driver: _tagsByRawPath (Ordinal); byName-only resolver; build table from
  _options.RawTags via FromTagConfig, threading WriteIdempotent + DeviceName.
  Multi-device: ResolveDeviceHost matches entry.DeviceName against options.Devices
  (by name, then host) -> def.DeviceHostAddress (TODO(v3 WaveC): live host from the
  Device row's DeviceConfig). DiscoverAsync now emits from the table.
- Factory: retire pre-declared tags[] DTO path; bind rawTags; keep Devices.
- Cli: BuildOptions serialises typed defs -> RawTagEntry via ToTagConfig.
- Tests: TwinCATRawTags helper; migrate Tags= -> RawTags=; rename parser tests to
  FromTagConfig; equipment/resolve-host/array tests delivered via RawTags.

Gate: Contracts + Driver build green; Driver.TwinCAT.Tests 192 pass, Cli.Tests 70 pass.

tests/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Cli.Tests/TwinCATCommandBaseTests.cs

@@ -99,7 +99,16 @@ public sealed class TwinCATCommandBaseTests
         options.Devices.Count.ShouldBe(1);
         options.Devices[0].HostAddress.ShouldBe("ads://10.0.0.1.1.1:851");
         options.Devices[0].DeviceName.ShouldBe("cli-10.0.0.1.1.1:851");
-        options.Tags.ShouldBe([tag]);
+        // v3: the CLI serialises its typed def into a RawTagEntry (RawPath = def.Name, DeviceName =
+        // def.DeviceHostAddress) that round-trips through the factory back to the same def.
+        options.RawTags.Count.ShouldBe(1);
+        var entry = options.RawTags[0];
+        entry.RawPath.ShouldBe("n1");
+        entry.DeviceName.ShouldBe(cmd.GatewayForTest);
+        TwinCAT.TwinCATTagDefinitionFactory.FromTagConfig(entry.TagConfig, entry.RawPath, out var roundTripped)
+            .ShouldBeTrue();
+        roundTripped.SymbolPath.ShouldBe("MAIN.x");
+        roundTripped.DataType.ShouldBe(TwinCAT.TwinCATDataType.DInt);
         options.Timeout.ShouldBe(TimeSpan.FromMilliseconds(4321));
         options.Probe.Enabled.ShouldBeFalse();
         options.EnableControllerBrowse.ShouldBeFalse();