fix(inbound-api): resolve InboundAPI-014..017 — return-value validation, reflection-gateway hardening, deadline-bound routed calls, RouteHelper test coverage

src/ScadaLink.InboundAPI/ServiceCollectionExtensions.cs

@@ -10,6 +10,10 @@ public static class ServiceCollectionExtensions
         services.AddSingleton<InboundScriptExecutor>();
         services.AddScoped<RouteHelper>();
 
+        // InboundAPI-017: routed calls go through the IInstanceRouter seam; the
+        // production implementation delegates to CommunicationService.
+        services.AddScoped<IInstanceRouter, CommunicationServiceInstanceRouter>();
+
         // InboundAPI-006 / InboundAPI-008: endpoint filter enforcing the request
         // body size cap and active-node gating for POST /api/{methodName}.
         services.AddSingleton<InboundApiEndpointFilter>();