Auto: abcip-2.4 — CSV tag import/export

CsvTagImporter / CsvTagExporter parse and emit Kepware-format AB CIP tag
CSVs (Tag Name, Address, Data Type, Respect Data Type, Client Access,
Scan Rate, Description, Scaling). Import maps Tag Name → AbCipTagDefinition.Name,
Address → TagPath, Data Type → DataType, Description → Description,
Client Access → Writable. Skips blank rows + ;/# section markers; honours
column reordering via header lookup; RFC-4180-ish quoting.

CsvImports collection on AbCipDriverOptions mirrors L5kImports/L5xImports
and is consumed by InitializeAsync (declared > L5K > L5X > CSV precedence).

CLI tag-export command dumps the merged tag table from a driver-options JSON
to a Kepware CSV — runs the same import-merge precedence the driver uses but
without contacting any PLC.

Tests cover R/W mapping, blank-row skip, quoted comma, escaped quote, name
prefix, unknown-type fall-through, header reordering, and a load → export →
reparse round-trip.

Closes #232

src/ZB.MOM.WW.OtOpcUa.Driver.AbCip/AbCipDriver.cs

@@ -152,6 +152,10 @@ public sealed class AbCipDriver : IDriver, IReadable, IWritable, ITagDiscovery,
                     declaredNames: declaredNames,
                     allTags: allTags);
             }
+            foreach (var import in _options.CsvImports)
+            {
+                MergeCsvImport(import, declaredNames, allTags);
+            }
 
             foreach (var tag in allTags)
             {
@@ -234,6 +238,43 @@ public sealed class AbCipDriver : IDriver, IReadable, IWritable, ITagDiscovery,
         }
     }
 
+    /// <summary>
+    ///     CSV-import variant of <see cref="MergeImport"/>. The CSV path produces
+    ///     <see cref="AbCipTagDefinition"/> records directly (no intermediate document) so we
+    ///     can't share the L5K/L5X parser-delegate signature. Merge semantics are identical:
+    ///     a name already covered by a declaration or an earlier import is left untouched so
+    ///     the precedence chain (declared > L5K > L5X > CSV) holds.
+    /// </summary>
+    private static void MergeCsvImport(
+        AbCipCsvImportOptions import,
+        HashSet<string> declaredNames,
+        List<AbCipTagDefinition> allTags)
+    {
+        if (string.IsNullOrWhiteSpace(import.DeviceHostAddress))
+            throw new InvalidOperationException(
+                "AbCip CSV import is missing DeviceHostAddress — every imported tag needs a target device.");
+
+        string? csvText = null;
+        if (!string.IsNullOrEmpty(import.FilePath))
+            csvText = System.IO.File.ReadAllText(import.FilePath);
+        else if (!string.IsNullOrEmpty(import.InlineText))
+            csvText = import.InlineText;
+        if (csvText is null) return;
+
+        var importer = new CsvTagImporter
+        {
+            DefaultDeviceHostAddress = import.DeviceHostAddress,
+            NamePrefix = import.NamePrefix,
+        };
+        var result = importer.Import(csvText);
+        foreach (var tag in result.Tags)
+        {
+            if (declaredNames.Contains(tag.Name)) continue;
+            allTags.Add(tag);
+            declaredNames.Add(tag.Name);
+        }
+    }
+
     public async Task ReinitializeAsync(string driverConfigJson, CancellationToken cancellationToken)
     {
         await ShutdownAsync(cancellationToken).ConfigureAwait(false);