Implement InMemory Transport Layer for StellaOps Router

- Added InMemoryTransportOptions class for configuration settings including timeouts and latency.
- Developed InMemoryTransportServer class to handle connections, frame processing, and event management.
- Created ServiceCollectionExtensions for easy registration of InMemory transport services.
- Established project structure and dependencies for InMemory transport library.
- Implemented comprehensive unit tests for endpoint discovery, connection management, request/response flow, and streaming capabilities.
- Ensured proper handling of cancellation, heartbeat, and hello frames within the transport layer.

src/Cli/StellaOps.Cli/Program.cs

@@ -32,6 +32,11 @@ internal static class Program
         services.AddAirGapEgressPolicy(configuration);
         services.AddStellaOpsCrypto(options.Crypto);
 
+        // CLI-AIRGAP-56-002: Add sealed mode telemetry for air-gapped operation
+        services.AddSealedModeTelemetryIfOffline(
+            options.IsOffline,
+            options.IsOffline ? Path.Combine(options.Offline.KitsDirectory, "telemetry") : null);
+
         services.AddLogging(builder =>
         {
             builder.ClearProviders();