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.

tools/stella-callgraph-node/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "stella-callgraph-node",
+  "version": "1.0.0",
+  "description": "Call graph extraction tool for JavaScript/TypeScript using Babel AST",
+  "main": "index.js",
+  "type": "module",
+  "bin": {
+    "stella-callgraph-node": "./index.js"
+  },
+  "scripts": {
+    "start": "node index.js",
+    "test": "node --test"
+  },
+  "keywords": [
+    "callgraph",
+    "ast",
+    "babel",
+    "static-analysis",
+    "security"
+  ],
+  "license": "AGPL-3.0-or-later",
+  "dependencies": {
+    "@babel/parser": "^7.23.0",
+    "@babel/traverse": "^7.23.0",
+    "@babel/types": "^7.23.0"
+  },
+  "devDependencies": {
+    "@types/node": "^20.0.0"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  }
+}