fix(drivers): flip runtime tag parsers to strict enum parsing (#457)

R2-11 Phase C. All six equipment-tag parsers (Modbus/S7/AbCip/AbLegacy/
TwinCAT/Focas) now read enum fields via the new TagConfigJson.TryReadEnumStrict:
absent -> fallback, valid -> parsed, present-but-invalid (typo) -> TryParse
returns false -> EquipmentTagRefResolver.TryResolve false -> driver surfaces
BadNodeIdUnknown, instead of the old lenient path that silently defaulted a
typo to a wrong-width Good.

Modbus flips all three enum fields (region/dataType/byteOrder); the other five
flip dataType. The deploy-time Deployment:TagConfigValidationMode=Error gate is
unchanged and remains the operator pre-flight.

Coverage:
- Six *EquipmentTagParserStrictnessTests inverted from Freeze_typo_* (lenient)
  to Typo_*_rejects_the_tag + Valid_*_still_parses.
- TagConfigJsonTests.TryReadEnumStrict_rejects_only_invalid matrix.
- Driver-level end-to-end proof:
  AbCipEquipmentTagTests.Driver_read_of_a_typod_dataType_ref_surfaces_BadNodeIdUnknown
  drives the real AbCipDriver.ReadAsync through resolve->status.

Golden parity corpus has no typo'd enums, so the flip is a no-op there.
Full solution builds clean; all six driver suites + core + parity + gate green.

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.Tests/S7EquipmentTagParserStrictnessTests.cs

@@ -4,14 +4,22 @@ using ZB.MOM.WW.OtOpcUa.Driver.S7;
 
 namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Tests;
 
-/// <summary>R2-11 (05/CONV-2) strictness surface for the S7 equipment-tag parser: lenient runtime freeze,
+/// <summary>R2-11 Phase C strictness surface for the S7 equipment-tag parser: the runtime is now STRICT — a
+/// typo'd <c>dataType</c> rejects the tag (<c>TryParse</c> ⇒ <see langword="false"/> ⇒ <c>BadNodeIdUnknown</c>),
 /// <c>Inspect</c> reports the typo, and the <c>writable</c> key is honoured (default true).</summary>
 public sealed class S7EquipmentTagParserStrictnessTests
 {
     [Fact]
-    public void Freeze_typo_dataType_still_defaults_to_Int16()
+    public void Typo_dataType_rejects_the_tag()
     {
-        S7EquipmentTagParser.TryParse("{\"address\":\"DB1.DBW0\",\"dataType\":\"Intt16\"}", out var def)
+        S7EquipmentTagParser.TryParse("{\"address\":\"DB1.DBW0\",\"dataType\":\"Intt16\"}", out _)
+            .ShouldBeFalse();
+    }
+
+    [Fact]
+    public void Valid_dataType_still_parses()
+    {
+        S7EquipmentTagParser.TryParse("{\"address\":\"DB1.DBW0\",\"dataType\":\"Int16\"}", out var def)
             .ShouldBeTrue();
         def.DataType.ShouldBe(S7DataType.Int16);
     }