diag: trace RTC synchronization and WSS clock state

ql-application/threadx/interface/custom_app/inc/time_diag.h

@@ -0,0 +1,12 @@
+#ifndef TALKINGQ_APP_TIME_DIAG_H
+#define TALKINGQ_APP_TIME_DIAG_H
+
+#include <time.h>
+
+void talkingq_time_diag_boot(void);
+/* Raw kernel snapshot only: safe to call before the application's first RTC read. */
+void talkingq_time_diag_log(const char *phase);
+/* Returns the original time(NULL) sample for the existing WSS threshold check. */
+time_t talkingq_time_diag_wss_time(void);
+
+#endif