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

pyproject.toml

@@ -0,0 +1,48 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "langcode-agent"
+version = "1.0.0"
+description = "AI Agent harness based on LangChain Deep Agents with memory, planning and MCP support"
+readme = "README.md"
+requires-python = ">=3.10"
+license = {text = "MIT"}
+authors = [
+    {name = "LangCode Team"}
+]
+keywords = ["ai", "agent", "langchain", "ollama", "mcp"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+
+dependencies = [
+    "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",
+]
+
+[project.scripts]
+langcode = "langcode:main"
+
+[project.urls]
+Homepage = "http://192.168.0.183:8085/truetype/langcode_agent"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["*"]