Add Tamil NER routing and WPF test harness for POC validation.

Introduce dual-script ONNX NER routing (English/Tamil/mixed), Tamil console samples and integration tests, model download scripts, and a resizable WPF MVVM harness with click-to-load prompts, batch validation, and runtime-adjustable detection panels.

tests/PiiRedaction.Core.Tests/Integration/GoldenPromptTests.cs

@@ -8,6 +8,7 @@ namespace PiiRedaction.Core.Tests.Integration;
 public sealed class GoldenPromptTests
 {
     [TestCaseSource(typeof(PromptScenarioCatalog), nameof(PromptScenarioCatalog.AllScenarios))]
+    [TestCaseSource(typeof(TamilPromptScenarioCatalog), nameof(TamilPromptScenarioCatalog.AllScenarios))]
     public void Sanitize_PromptScenario_ProducesExpectedOutput(PromptScenario scenario)
     {
         var sanitizer = ProductionPipelineFactory.CreateForScenario(scenario);

tests/PiiRedaction.Core.Tests/Integration/RealTamilPipelineTests.cs

@@ -0,0 +1,106 @@
+using FluentAssertions;
+using PiiRedaction.Core.Abstractions;
+using PiiRedaction.Core.Models;
+using PiiRedaction.Core.Tests.TestSupport;
+using PiiRedaction.Tests.Shared;
+
+namespace PiiRedaction.Core.Tests.Integration;
+
+/// <summary>
+/// End-to-end pipeline proof using routed English + Tamil ONNX NER models.
+/// </summary>
+[TestFixture]
+[Category("TamilNer")]
+public sealed class RealTamilPipelineTests : RealRoutingNerModelFixture
+{
+    private IPromptSanitizer _sanitizer = null!;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUpPipeline()
+    {
+        _sanitizer = ProductionPipelineFactory.CreateWithRoutingRealModels(EnglishRunner, TamilRunner);
+    }
+
+    [Test]
+    public void Sanitize_TamilCustomerNameOnly_RedactsPerson()
+    {
+        const string prompt =
+            "வாடிக்கையாளர் ராஜேஷ் குமார் சேமிப்பு கணக்கில் அங்கீகரிக்கப்படாத பரிவர்த்தனைகளைப் புகாரளித்தார்.";
+
+        var result = _sanitizer.Sanitize(new SanitizationRequest(prompt));
+
+        result.SanitizedPrompt.Should().Contain("<PERSON_1>");
+        result.SanitizedPrompt.Should().NotContain("ராஜேஷ்");
+        result.DetectedEntities.Should().Contain(entity =>
+            entity.Type == PiiEntityType.Person && entity.Source == PiiDetectionSource.Ner);
+    }
+
+    [Test]
+    public void Sanitize_TamilWithPhonePan_RedactsPersonPhoneAndPan()
+    {
+        const string prompt = "வாடிக்கையாளர் ராஜேஷ் குமார் தொலைபேசி 9876543210 PAN ABCDE1234F.";
+
+        var result = _sanitizer.Sanitize(new SanitizationRequest(prompt));
+
+        result.SanitizedPrompt.Should().Contain("<PERSON_1>");
+        result.SanitizedPrompt.Should().Contain("<PHONE_1>");
+        result.SanitizedPrompt.Should().Contain("<PAN_1>");
+        result.SanitizedPrompt.Should().NotContainAny("ராஜேஷ்", "9876543210", "ABCDE1234F");
+    }
+
+    [Test]
+    public void Sanitize_TanglishCustomer_RedactsPersonAndPhone()
+    {
+        const string prompt = "Customer Senthil phone 9876543210 reported a failed UPI transfer.";
+
+        var result = _sanitizer.Sanitize(new SanitizationRequest(prompt));
+
+        result.SanitizedPrompt.Should().Contain("<PERSON_1>");
+        result.SanitizedPrompt.Should().Contain("<PHONE_1>");
+        result.SanitizedPrompt.Should().NotContainAny("Senthil", "9876543210");
+    }
+
+    [Test]
+    public void Sanitize_MixedTamilEnglish_RedactsPersonAndPhone()
+    {
+        const string prompt = "வாடிக்கையாளர் Ravi Kumar phone 9876543210 disputed the charge.";
+
+        var result = _sanitizer.Sanitize(new SanitizationRequest(prompt));
+
+        result.SanitizedPrompt.Should().Contain("<PERSON_1>");
+        result.SanitizedPrompt.Should().Contain("<PHONE_1>");
+        result.SanitizedPrompt.Should().NotContainAny("Ravi Kumar", "9876543210");
+    }
+
+    [Test]
+    public void Sanitize_TamilFullFinancial_RedactsAllPiiTypes()
+    {
+        const string prompt =
+            "வாடிக்கையாளர் ராஜேஷ் குமார் மின்னஞ்சல் ravi.kumar@gmail.com தொலைபேசி 9876543210 LoanNumber LN-456789 PAN ABCDE1234F. இந்த வாடிக்கையாளர் புகாரை சுருக்கமாக கூறுங்கள்.";
+
+        var result = _sanitizer.Sanitize(new SanitizationRequest(prompt));
+
+        result.SanitizedPrompt.Should().Contain("<PERSON_1>");
+        result.SanitizedPrompt.Should().Contain("<EMAIL_1>");
+        result.SanitizedPrompt.Should().Contain("<PHONE_1>");
+        result.SanitizedPrompt.Should().Contain("<LOAN_NUMBER_1>");
+        result.SanitizedPrompt.Should().Contain("<PAN_1>");
+        result.SanitizedPrompt.Should().NotContainAny(
+            "ராஜேஷ்",
+            "ravi.kumar@gmail.com",
+            "9876543210",
+            "LN-456789",
+            "ABCDE1234F");
+    }
+
+    [Test]
+    public void Sanitize_CleanTamilQuestion_PassesThroughWithoutPersonRedaction()
+    {
+        const string prompt = "பணத்தை திரும்பப் பெறுவது எப்படி?";
+
+        var result = _sanitizer.Sanitize(new SanitizationRequest(prompt));
+
+        result.SanitizedPrompt.Should().Be(prompt);
+        result.DetectedEntities.Should().BeEmpty();
+    }
+}