fix: return non-zero exit code when remove/prune fail due to dirty worktrees (#23)

* Initial plan

* fix: return non-zero exit code when remove/prune fail due to dirty worktrees

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Author: Copilot

src/commands/prune.ts

@@ -209,7 +209,7 @@ async function runPrune(options: PruneCommandOptions): Promise<void> {
   if (worktreesToRemove.length === 0) {
     console.log(chalk.yellow("No worktrees to remove (all candidates have uncommitted changes)."));
     console.log(chalk.yellow("Use --force to remove them anyway."));
-    return;
+    process.exit(1);
   }
 
   console.log(chalk.blue("\nRemoving worktrees..."));

src/commands/remove.ts

@@ -81,7 +81,7 @@ async function runRemove(
     console.log(
       chalk.yellow("Use --force to remove it anyway, or commit/stash your changes first."),
     );
-    return;
+    process.exit(1);
   }
 
   // Confirm removal