fix(driver-ablegacy): resolve Medium code-review finding (Driver.AbLegacy-012)

Consume previously-dead AbLegacyPlcFamilyProfile fields:

- DeviceState.EffectiveCipPath applies DefaultCipPath when the parsed host
  address has an empty CIP path (SLC 500 / PLC-5 misconfigured without /1,0
  now gets the profile-supplied default route). All three tag/parent/probe
  Create() callers updated.
- InitializeAsync validates each tag's DataType against SupportsLongFile /
  SupportsStringFile and throws InvalidOperationException at init time so a
  MicroLogix Long tag or similar fails early rather than at runtime with an
  opaque comms error.
- MaxTagBytes tracked as a follow-up (string/array chunking requires broader
  design work).

Tests added for CipPath fallback and Long/String type validation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy/AbLegacyDriver.cs

@@ -59,6 +59,24 @@ public sealed class AbLegacyDriver : IDriver, IReadable, IWritable, ITagDiscover
             }
             foreach (var tag in _options.Tags) _tagsByName[tag.Name] = tag;
 
+            // Validate tag types against their device's family profile. Long (32-bit integer)
+            // and String (ST-file) are not supported by all PCCC families; reject them early
+            // so a misconfigured tag fails at init time with a clear message rather than
+            // surfacing an opaque comms error at runtime.
+            foreach (var tag in _options.Tags)
+            {
+                if (!_devices.TryGetValue(tag.DeviceHostAddress, out var deviceForTag)) continue;
+                var profile = deviceForTag.Profile;
+                if (tag.DataType == AbLegacyDataType.Long && !profile.SupportsLongFile)
+                    throw new InvalidOperationException(
+                        $"Tag '{tag.Name}' is typed as Long but device '{tag.DeviceHostAddress}' " +
+                        $"(family {deviceForTag.Options.PlcFamily}) does not support L-files.");
+                if (tag.DataType == AbLegacyDataType.String && !profile.SupportsStringFile)
+                    throw new InvalidOperationException(
+                        $"Tag '{tag.Name}' is typed as String but device '{tag.DeviceHostAddress}' " +
+                        $"(family {deviceForTag.Options.PlcFamily}) does not support ST-files.");
+            }
+
             // Probe loops — one per device when enabled + probe address configured.
             if (_options.Probe.Enabled && !string.IsNullOrWhiteSpace(_options.Probe.ProbeAddress))
             {
@@ -333,7 +351,7 @@ public sealed class AbLegacyDriver : IDriver, IReadable, IWritable, ITagDiscover
         var probeParams = new AbLegacyTagCreateParams(
             Gateway: state.ParsedAddress.Gateway,
             Port: state.ParsedAddress.Port,
-            CipPath: state.ParsedAddress.CipPath,
+            CipPath: state.EffectiveCipPath,
             LibplctagPlcAttribute: state.Profile.LibplctagPlcAttribute,
             TagName: _options.Probe.ProbeAddress!,
             Timeout: _options.Probe.Timeout);
@@ -466,7 +484,7 @@ public sealed class AbLegacyDriver : IDriver, IReadable, IWritable, ITagDiscover
             var runtime = _tagFactory.Create(new AbLegacyTagCreateParams(
                 Gateway: device.ParsedAddress.Gateway,
                 Port: device.ParsedAddress.Port,
-                CipPath: device.ParsedAddress.CipPath,
+                CipPath: device.EffectiveCipPath,
                 LibplctagPlcAttribute: device.Profile.LibplctagPlcAttribute,
                 TagName: parentName,
                 Timeout: _options.Timeout));
@@ -509,7 +527,7 @@ public sealed class AbLegacyDriver : IDriver, IReadable, IWritable, ITagDiscover
             var runtime = _tagFactory.Create(new AbLegacyTagCreateParams(
                 Gateway: device.ParsedAddress.Gateway,
                 Port: device.ParsedAddress.Port,
-                CipPath: device.ParsedAddress.CipPath,
+                CipPath: device.EffectiveCipPath,
                 LibplctagPlcAttribute: device.Profile.LibplctagPlcAttribute,
                 TagName: parsed.ToLibplctagName(),
                 Timeout: _options.Timeout));
@@ -543,6 +561,16 @@ public sealed class AbLegacyDriver : IDriver, IReadable, IWritable, ITagDiscover
         public AbLegacyDeviceOptions Options { get; } = options;
         public AbLegacyPlcFamilyProfile Profile { get; } = profile;
 
+        /// <summary>
+        ///     The CIP path to pass to libplctag. When the parsed host address has an empty CIP
+        ///     path (e.g. <c>ab://10.0.0.5/</c>), the profile-supplied default is used instead so
+        ///     that a SLC 500 misconfigured without an explicit path still gets the required
+        ///     <c>1,0</c> backplane route. MicroLogix has an empty default by design (direct EIP).
+        /// </summary>
+        public string EffectiveCipPath => parsedAddress.CipPath.Length > 0
+            ? parsedAddress.CipPath
+            : profile.DefaultCipPath;
+
         /// <summary>
         ///     Per-tag cached runtimes. <see cref="System.Collections.Concurrent.ConcurrentDictionary{TKey,TValue}"/>
         ///     avoids the check-then-act race present on a plain <c>Dictionary</c>: two concurrent