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.

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.Contracts/S7EquipmentTagParser.cs

@@ -32,7 +32,9 @@ public static class S7EquipmentTagParser
                 return false;
             var address = addrEl.GetString();
             if (string.IsNullOrWhiteSpace(address)) return false;
-            var dataType = TagConfigJson.ReadEnumOrDefault(root, "dataType", S7DataType.Int16);
+            // Strict enum read (R2-11 Phase C): a typo'd dataType rejects the tag (→ BadNodeIdUnknown)
+            // instead of silently defaulting to a wrong-width Good.
+            if (!TagConfigJson.TryReadEnumStrict(root, "dataType", S7DataType.Int16, out var dataType)) return false;
             var stringLength = ReadInt(root, "stringLength");
             // Range-guard applies only to String tags: an S7 string can't exceed 254 chars, and a
             // negative length is meaningless. For non-String types stringLength is irrelevant and any