Fix linter errors in CLI and tests

src/py_dvt_ate/app/cli.py

@@ -255,7 +255,7 @@ def export_report_cmd(
             "[red]Error:[/red] Report generation requires additional dependencies.\n"
             "Install with: [cyan]pip install py_dvt_ate[reports][/cyan]"
         )
-        raise typer.Exit(1)
+        raise typer.Exit(1) from None
 
     # Load config
     if config_file is None:
@@ -295,7 +295,7 @@ def export_report_cmd(
                 full_run_id = UUID(run_id)
             except ValueError:
                 console.print(f"[red]Error:[/red] Invalid run ID: '{run_id}'")
-                raise typer.Exit(1)
+                raise typer.Exit(1) from None
 
         # Create report config
         report_config = ReportConfig(
@@ -324,7 +324,7 @@ def export_report_cmd(
         raise
     except Exception as e:
         console.print(f"[red]Error generating report:[/red] {e}")
-        raise typer.Exit(1)
+        raise typer.Exit(1) from None
     finally:
         repo.close()