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.

src/PiiRedaction.TestHarness.Wpf/Services/IScriptAnalysisService.cs

@@ -0,0 +1,8 @@
+using PiiRedaction.Core.Detection;
+
+namespace PiiRedaction.TestHarness.Wpf.Services;
+
+public interface IScriptAnalysisService
+{
+    ScriptComposition GetComposition(string text);
+}