docs: update readme

README.md

@@ -266,6 +266,14 @@ All CLI commands support JSON output for easier parsing and integration with scr
 ./bin/goyco --json status | jq '.status'
 ```
 
+You can also set JSON output as the default by setting the `CLI_JSON_OUTPUT` environment variable to `true` in your `.env` file:
+
+```bash
+CLI_JSON_OUTPUT=true
+```
+
+When set, all CLI commands will output JSON by default. You can still override this by using the `--json` flag explicitly or by setting it to `false` in the environment variable.
+
 **Note for destructive operations**: When using `--json` with `prune` commands, you must also use the `--yes` flag to skip interactive confirmation prompts:
 
 ```bash