fix: Python 3.8 compatibility for CLI

- Replace str | None with Optional[str] in export.py
- Replace list[str] with List[str] in config.py
- Add missing typing imports for compatibility
- Ensures CLI works on Python 3.8 systems

tito/commands/export.py

@@ -7,6 +7,7 @@ import sys
 import re
 from argparse import ArgumentParser, Namespace
 from pathlib import Path
+from typing import Optional
 from rich.panel import Panel
 from rich.text import Text
 
@@ -69,7 +70,7 @@ class ExportCommand(BaseCommand):
         
         return sorted(modules)
 
-    def _show_export_details(self, console, module_name: str | None = None):
+    def _show_export_details(self, console, module_name: Optional[str] = None):
         """Show detailed export information including where each module exports to."""
         exports_text = Text()
         exports_text.append("📦 Export Details:\n", style="bold cyan")

tito/core/config.py

@@ -5,7 +5,7 @@ Configuration management for TinyTorch CLI.
 import os
 import sys
 from pathlib import Path
-from typing import Dict, Any, Optional
+from typing import Dict, Any, Optional, List
 from dataclasses import dataclass
 
 @dataclass
@@ -52,7 +52,7 @@ class CLIConfig:
             bin_dir=project_root / 'bin'
         )
     
-    def validate(self) -> list[str]:
+    def validate(self) -> List[str]:
         """Validate the configuration and return any issues."""
         issues = []