feat(driver-s7): shared TagConfigJson readers, writable key, Inspect warnings (R2-11)

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

@@ -1,4 +1,5 @@
 using System.Text.Json;
+using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 
 namespace ZB.MOM.WW.OtOpcUa.Driver.S7;
 
@@ -31,7 +32,7 @@ public static class S7EquipmentTagParser
                 return false;
             var address = addrEl.GetString();
             if (string.IsNullOrWhiteSpace(address)) return false;
-            var dataType = ReadEnum(root, "dataType", S7DataType.Int16);
+            var dataType = TagConfigJson.ReadEnumOrDefault(root, "dataType", S7DataType.Int16);
             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
@@ -42,11 +43,14 @@ public static class S7EquipmentTagParser
             // that here so the driver's transient def agrees byte-for-byte with the materialised
             // OPC UA node's ValueRank/ArrayDimensions. Absent / isArray=false ⇒ null (scalar).
             var arrayCount = ReadArrayCount(root);
+            // "writable" defaults to true when absent (today's value); node-level authz still governs
+            // writes. Honouring the key makes read-only equipment tags authorable (UNDER-6).
+            var writable = TagConfigJson.ReadWritable(root);
             def = new S7TagDefinition(
                 Name: reference,
                 Address: address,
                 DataType: dataType,
-                Writable: true, // node-level authz governs writes
+                Writable: writable,
                 StringLength: stringLength == 0 ? MaxStringLength : stringLength,
                 ArrayCount: arrayCount);
             return true;
@@ -56,9 +60,35 @@ public static class S7EquipmentTagParser
         catch (InvalidOperationException) { return false; }
     }
 
-    private static TEnum ReadEnum<TEnum>(JsonElement o, string name, TEnum fallback) where TEnum : struct, Enum
-        => o.TryGetProperty(name, out var e) && e.ValueKind == JsonValueKind.String
-           && Enum.TryParse<TEnum>(e.GetString(), ignoreCase: true, out var v) ? v : fallback;
+    /// <summary>
+    ///     Deploy-time inspection (05/CONV-2): warns on a present-but-invalid <c>dataType</c> (silently
+    ///     defaulted by the lenient runtime) and on a structurally unparseable TagConfig (a silent
+    ///     <c>BadNodeIdUnknown</c> at runtime). Empty when clean or not an equipment-tag object. Never throws.
+    /// </summary>
+    /// <param name="reference">The equipment tag's TagConfig JSON.</param>
+    /// <returns>The warnings; empty when clean.</returns>
+    public static IReadOnlyList<string> Inspect(string reference)
+    {
+        var warnings = new List<string>();
+        if (string.IsNullOrWhiteSpace(reference) || reference[0] != '{') return warnings;
+        try
+        {
+            using var doc = JsonDocument.Parse(reference);
+            var root = doc.RootElement;
+            if (root.ValueKind != JsonValueKind.Object)
+            {
+                warnings.Add("S7 TagConfig root is not a JSON object — the tag will not resolve (BadNodeIdUnknown).");
+                return warnings;
+            }
+            var w = TagConfigJson.DescribeInvalidEnum<S7DataType>(root, "dataType");
+            if (w is not null) warnings.Add(w);
+        }
+        catch (JsonException)
+        {
+            warnings.Add("S7 TagConfig is not valid JSON — the tag will not resolve (BadNodeIdUnknown).");
+        }
+        return warnings;
+    }
 
     private static int ReadInt(JsonElement o, string name)
         => o.TryGetProperty(name, out var e) && e.ValueKind == JsonValueKind.Number

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.Contracts/ZB.MOM.WW.OtOpcUa.Driver.S7.Contracts.csproj

@@ -7,6 +7,11 @@
         <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     </PropertyGroup>
 
-    <!-- NO PackageReference. NO ProjectReference. -->
+    <!-- NO PackageReference. ProjectReference only to the zero-dependency Core.Abstractions leaf
+         (R2-11 05/CONV-2 — shared TagConfigJson readers beside EquipmentTagRefResolver; adds no
+         dependency-closure growth for lightweight AdminUI/Cli consumers). -->
+    <ItemGroup>
+        <ProjectReference Include="..\..\Core\ZB.MOM.WW.OtOpcUa.Core.Abstractions\ZB.MOM.WW.OtOpcUa.Core.Abstractions.csproj"/>
+    </ItemGroup>
 
 </Project>