feat: add stella-callgraph-node for JavaScript/TypeScript call graph extraction

- Implemented a new tool `stella-callgraph-node` that extracts call graphs from JavaScript/TypeScript projects using Babel AST.
- Added command-line interface with options for JSON output and help.
- Included functionality to analyze project structure, detect functions, and build call graphs.
- Created a package.json file for dependency management.

feat: introduce stella-callgraph-python for Python call graph extraction

- Developed `stella-callgraph-python` to extract call graphs from Python projects using AST analysis.
- Implemented command-line interface with options for JSON output and verbose logging.
- Added framework detection to identify popular web frameworks and their entry points.
- Created an AST analyzer to traverse Python code and extract function definitions and calls.
- Included requirements.txt for project dependencies.

chore: add framework detection for Python projects

- Implemented framework detection logic to identify frameworks like Flask, FastAPI, Django, and others based on project files and import patterns.
- Enhanced the AST analyzer to recognize entry points based on decorators and function definitions.

examples/router/tests/Examples.Integration.Tests/GatewayFixture.cs

@@ -6,6 +6,7 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Hosting;
 using StellaOps.Microservice;
+using StellaOps.Router.Common.Abstractions;
 using StellaOps.Router.Common.Enums;
 using StellaOps.Router.Transport.InMemory;
 using Xunit;
@@ -94,8 +95,7 @@ public sealed class GatewayFixture : IAsyncLifetime
         _inventoryHost = inventoryBuilder.Build();
         await _inventoryHost.StartAsync();
 
-        // Allow services to register
-        await Task.Delay(100);
+        await WaitForGatewayReadyAsync(TimeSpan.FromSeconds(5));
     }
 
     public async Task DisposeAsync()
@@ -116,4 +116,32 @@ public sealed class GatewayFixture : IAsyncLifetime
 
         _gatewayFactory?.Dispose();
     }
+
+    private async Task WaitForGatewayReadyAsync(TimeSpan timeout)
+    {
+        if (_gatewayFactory is null)
+        {
+            throw new InvalidOperationException("Gateway factory not initialized.");
+        }
+
+        var routingState = _gatewayFactory.Services.GetRequiredService<IGlobalRoutingState>();
+        var deadline = DateTimeOffset.UtcNow.Add(timeout);
+
+        while (DateTimeOffset.UtcNow < deadline)
+        {
+            var connections = routingState.GetAllConnections();
+            if (connections.Count >= 2 &&
+                routingState.ResolveEndpoint("GET", "/items") is not null &&
+                routingState.ResolveEndpoint("POST", "/invoices") is not null)
+            {
+                return;
+            }
+
+            await Task.Delay(50);
+        }
+
+        var currentConnections = routingState.GetAllConnections();
+        throw new TimeoutException(
+            $"Gateway routing state not ready after {timeout}. Connections={currentConnections.Count}.");
+    }
 }