fix: remove fn_log from bench to keep JSON-only on stdout

bench_runner.cpp

@@ -11,7 +11,6 @@
 
 #include "bench_runner.h"
 #include "data_table/data_table.h"
-#include "core/logger.h"
 
 #include <imgui.h>
 
@@ -279,12 +278,6 @@ void Runner::finish_scenario() {
     }
     res.pass = (res.fps_p1 >= cfg_.fps_threshold);
 
-    fn_log::log_info("bench: scenario=%s frames=%zu fps_p50=%.1f fps_p1=%.1f "
-                     "mem=%.1fMB cpu=%.1f%% %s",
-        scenario_name(s), frame_fps_.size(),
-        res.fps_p50, res.fps_p1, res.mem_rss_mb, res.cpu_pct,
-        res.pass ? "PASS" : "FAIL");
-
     fprintf(stderr, "[bench] %s: fps_p50=%.1f fps_p1=%.1f mem=%.1fMB %s\n",
         scenario_name(s), res.fps_p50, res.fps_p1, res.mem_rss_mb,
         res.pass ? "PASS" : "FAIL");