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/Models/BatchRunResult.cs

@@ -0,0 +1,23 @@
+namespace PiiRedaction.TestHarness.Wpf.Models;
+
+public sealed record RedactionOutcome(
+    string OriginalPrompt,
+    string SanitizedPrompt,
+    IReadOnlyList<RedactionDisplayModel> DetectedEntities,
+    IReadOnlyList<PlaceholderDisplayModel> Placeholders,
+    long ElapsedMilliseconds,
+    bool HasLeak);
+
+public sealed record BatchScenarioResult(
+    TestPromptScenario Scenario,
+    bool Passed,
+    string? FailureReason,
+    int EntityCount,
+    long ElapsedMilliseconds);
+
+public sealed record BatchRunSummary(
+    int Total,
+    int Passed,
+    int Failed,
+    IReadOnlyList<BatchScenarioResult> Results,
+    long TotalElapsedMilliseconds);