feat(bench): show human-readable output even when outputting JSON

Changed behavior to always display human-readable benchmark results,
regardless of output format. JSON output is now additive:
- Console output: always shown
- JSON output: also generated if --format json is specified

Benefits:
- Users can see progress and results in real-time
- JSON can be saved to file with --output for later analysis
- No need to choose between readability and structured data

Before: --format json hid all human-readable output
After: --format json shows readable output AND generates JSON

Author: claude

src/bin/bench_throughput.rs

@@ -829,9 +829,7 @@ fn main() {
         match benchmark_template(template_name, template_str, &sizes, iterations, detailed) {
             Ok(results) => {
                 println!("✓");
-                if format == "console" {
-                    print_template_results(template_name, &results, detailed);
-                }
+                print_template_results(template_name, &results, detailed);
                 all_results.push((*template_name, results));
             }
             Err(e) => {
@@ -841,9 +839,9 @@ fn main() {
         }
     }
 
-    if format == "console" {
-        print_summary(&all_results);
-    } else if format == "json" {
+    print_summary(&all_results);
+
+    if format == "json" {
         if let Err(e) = output_json(&all_results, output_path.map(|s| s.as_str())) {
             eprintln!("Error writing JSON output: {}", e);
             std::process::exit(1);