feat: log fps/frame/tick diagnostics in example clients

Once/sec via stk_log, using skele's new fps.h/clock.h counters.

src/client/main.c

@@ -2,8 +2,10 @@
 #include <skele/client/input.h>
 #include <skele/client/video.h>
 #include <skele/clock.h>
+#include <skele/fps.h>
 #include <skele/skele.h>
 #include <stk/stk.h>
+#include <stk/stk_log.h>
 
 static uint8_t running = 1;
 
@@ -12,7 +14,7 @@ static void on_signal(void) { running = 0; }
 int main(int argc, char *argv[])
 {
 	skele_video_config_t video_cfg;
-	uint64_t last, now, elapsed, accum = 0;
+	uint64_t last, now, elapsed, accum = 0, last_print = 0;
 
 	skele_clock_init(on_signal);
 
@@ -65,6 +67,17 @@ int main(int argc, char *argv[])
 		}
 
 		skele_video_present();
+
+		if (now - last_print >= 1000000000ULL) {
+			stk_log(STK_LOG_INFO,
+				"fps=%.1f frame=%.2fms/%.2fms tps=%.1f tick=%lluns/%lluns idle=%lluns",
+				skele_fps, skele_frame_time_ms,
+				skele_frame_budget_ms, skele_tps,
+				(unsigned long long)skele_tick_time_ns,
+				(unsigned long long)skele_tick_ns,
+				(unsigned long long)skele_tick_idle_ns);
+			last_print = now;
+		}
 	}
 
 	game_shutdown();