cli: suppress stack traces in user-facing errors

• [MSN] No active missions on the board
• [EXC] Board idle, no stories queued or active
• [HLT] 2 warnings, no structural errors detected

Author: rupurt

crates/keel-cli/src/main.rs

@@ -13,8 +13,9 @@ mod command_regression_tests;
 #[cfg(test)]
 mod drift_tests;
 
-use anyhow::Result;
-
-fn main() -> Result<()> {
-    cli::run()
+fn main() {
+    if let Err(error) = cli::run() {
+        eprintln!("Error: {error}");
+        std::process::exit(1);
+    }
 }