feat: migliora gestione errori con suggerimenti contextuali

- Aggiunge config_manager a load_model_from_config() per usare config attive
- Migliora error handling con tipo eccezione e suggerimenti
- Aggiunge pyproject.toml e setup.py per installazione pip

setup.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+"""
+LangCode Agent - Setup
+"""
+from setuptools import setup, find_packages
+
+setup(
+    name="langcode-agent",
+    version="1.0.0",
+    description="AI Agent harness based on LangChain Deep Agents",
+    author="LangCode Team",
+    packages=find_packages(),
+    python_requires=">=3.10",
+    install_requires=[
+        "deepagents>=0.0.34",
+        "langchain>=0.3.0",
+        "langchain-community>=0.3.0",
+        "langchain-openai>=0.1.0",
+        "cryptography>=41.0.0",
+        "requests>=2.31.0",
+        "pyyaml>=6.0",
+        "fastapi>=0.104.0",
+        "uvicorn>=0.24.0",
+        "pydantic>=2.5.0",
+        "pytest>=7.4.0",
+    ],
+    entry_points={
+        "console_scripts": [
+            "langcode=langcode:main",
+        ],
+    },
+)