feat: Initialize Zastava Webhook service with TLS and Authority authentication

- Added Program.cs to set up the web application with Serilog for logging, health check endpoints, and a placeholder admission endpoint.
- Configured Kestrel server to use TLS 1.3 and handle client certificates appropriately.
- Created StellaOps.Zastava.Webhook.csproj with necessary dependencies including Serilog and Polly.
- Documented tasks in TASKS.md for the Zastava Webhook project, outlining current work and exit criteria for each task.

src/StellaOps.Scanner.Analyzers.Lang.Tests/TestUtilities/TestPaths.cs

@@ -0,0 +1,53 @@
+namespace StellaOps.Scanner.Analyzers.Lang.Tests.TestUtilities;
+
+public static class TestPaths
+{
+    public static string ResolveFixture(params string[] segments)
+    {
+        var baseDirectory = AppContext.BaseDirectory;
+        var parts = new List<string> { baseDirectory };
+        parts.AddRange(new[] { "Fixtures" });
+        parts.AddRange(segments);
+        return Path.GetFullPath(Path.Combine(parts.ToArray()));
+    }
+
+    public static string CreateTemporaryDirectory()
+    {
+        var root = Path.Combine(AppContext.BaseDirectory, "tmp", Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(root);
+        return root;
+    }
+
+    public static void SafeDelete(string directory)
+    {
+        if (string.IsNullOrWhiteSpace(directory) || !Directory.Exists(directory))
+        {
+            return;
+        }
+
+        try
+        {
+            Directory.Delete(directory, recursive: true);
+        }
+        catch
+        {
+            // Swallow cleanup exceptions to avoid masking test failures.
+        }
+    }
+
+    public static string ResolveProjectRoot()
+    {
+        var directory = AppContext.BaseDirectory;
+        while (!string.IsNullOrEmpty(directory))
+        {
+            if (File.Exists(Path.Combine(directory, "StellaOps.Scanner.Analyzers.Lang.Tests.csproj")))
+            {
+                return directory;
+            }
+
+            directory = Path.GetDirectoryName(directory) ?? string.Empty;
+        }
+
+        throw new InvalidOperationException("Unable to locate project root.");
+    }
+}