fix(cortex-cli): exit with non-zero code on JSON parse failure in import command

Fixes bounty issue #1536

The import command was printing an error message when encountering
malformed JSON but exiting with code 0. This fix ensures the process
exits with code 1 when JSON parsing fails, allowing scripts and CI
pipelines to properly detect the error condition.

Author: factorydroid

cortex-cli/src/import_cmd.rs

@@ -51,8 +51,13 @@ impl ImportCommand {
             };
 
         // Parse the export
-        let export: SessionExport = serde_json::from_str(&json_content)
-            .with_context(|| "Failed to parse session export JSON")?;
+        let export: SessionExport = match serde_json::from_str(&json_content) {
+            Ok(export) => export,
+            Err(e) => {
+                eprintln!("Error: Failed to parse session export JSON: {e}");
+                std::process::exit(1);
+            }
+        };
 
         // Validate version
         if export.version != 1 {