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/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests/TwinCATLowFindingsRegressionTests.cs

@@ -182,30 +182,15 @@ public sealed class TwinCATLowFindingsRegressionTests
 
     // ---- Driver.TwinCAT-016 — gap-fill tests for previously closed findings ----
 
-    /// <summary>Verifies that structure-typed pre-declared tags are rejected at configuration parse time.</summary>
+    /// <summary>Verifies that a Structure-typed raw tag is rejected by the tag-definition factory.</summary>
     [Fact]
-    public void Structure_typed_pre_declared_tag_is_rejected_at_config_parse()
+    public void Structure_typed_raw_tag_is_rejected_by_the_factory()
     {
-        // Driver.TwinCAT-003 — config-time rejection. A Structure tag must fail loudly with a
-        // clear error rather than reading as a garbage int blob or failing late on a write.
-        var json = JsonSerializer.Serialize(new
-        {
-            devices = new[] { new { hostAddress = DeviceA } },
-            tags = new[]
-            {
-                new
-                {
-                    name = "Udt1",
-                    deviceHostAddress = DeviceA,
-                    symbolPath = "MAIN.fbInstance",
-                    dataType = "Structure",
-                },
-            },
-        });
-        var ex = Should.Throw<InvalidOperationException>(() =>
-            TwinCATDriverFactoryExtensions.ParseOptionsForTests(json, "drv-1"));
-        ex.Message.ShouldContain("Structure");
-        ex.Message.ShouldContain("Udt1");
+        // Driver.TwinCAT-003 — v3 the mapper is the sole tag path. A Structure tag must NOT map to a
+        // definition (returns false ⇒ the driver skips it ⇒ BadNodeIdUnknown) rather than reading as a
+        // garbage int blob or failing late on a write.
+        var blob = """{"symbolPath":"MAIN.fbInstance","dataType":"Structure"}""";
+        TwinCATTagDefinitionFactory.FromTagConfig(blob, "equip/Udt1", out _).ShouldBeFalse();
     }
 
     /// <summary>Verifies that the probe loop and read operations share one client per device.</summary>
@@ -223,7 +208,7 @@ public sealed class TwinCATLowFindingsRegressionTests
         var drv = new TwinCATDriver(new TwinCATDriverOptions
         {
             Devices = [new TwinCATDeviceOptions(DeviceA)],
-            Tags = [new TwinCATTagDefinition("X", DeviceA, "GVL.X", TwinCATDataType.DInt)],
+            RawTags = TwinCATRawTags.Entries([new TwinCATTagDefinition("X", DeviceA, "GVL.X", TwinCATDataType.DInt)]),
             Probe = new TwinCATProbeOptions
             {
                 Enabled = true,