fix(bindings): add SafeHandleWrapper + memory growth checks; bump 0.9.1 (#571)

- Introduce SafeHandleWrapper with gating, short drain wait, and deferred release on last in-flight exit.
- Wire Engine/Program/Rvm/CompiledPolicy to wrapper (centralized handle use, interop helper).
- Add C# memory growth tests (using/finalizer paths) and extend xtask C# runner options.
- Add pooled marshalling utilities, ResultHelpers, and API cleanups; update versions/changelog.

Fixes #570. Closes #554

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

bindings/csharp/Benchmarks/Program.cs

@@ -7,7 +7,7 @@ namespace Benchmarks
         static void Main(string[] args)
         {
             Console.WriteLine("=== Regorus C# Benchmarks ===\n");
-            
+
             try
             {
                 Console.WriteLine("Running Engine Evaluation Benchmark...");
@@ -17,9 +17,9 @@ namespace Benchmarks
             {
                 Console.WriteLine($"Engine benchmark failed: {ex.Message}");
             }
-            
+
             Console.WriteLine("\n" + new string('=', 80) + "\n");
-            
+
             try
             {
                 Console.WriteLine("Running Compiled Policy Evaluation Benchmark...");
@@ -29,7 +29,7 @@ namespace Benchmarks
             {
                 Console.WriteLine($"Compiled policy benchmark failed: {ex.Message}");
             }
-            
+
             Console.WriteLine("\n=== Benchmarks Complete ===");
         }
     }