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.OS/Model/AnalyzerWarning.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace StellaOps.Scanner.Analyzers.OS;
+
+public sealed record AnalyzerWarning(string Code, string Message)
+{
+    public static AnalyzerWarning From(string code, string message)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(code);
+        ArgumentException.ThrowIfNullOrWhiteSpace(message);
+        return new AnalyzerWarning(code.Trim(), message.Trim());
+    }
+}