move saving-grace back behind the curtain

If hero survives a killing blow via saving-grace, report that to
livelog but hide it from player's own #chronicle.

Only reveal whether saving-grace was used up during end-of-game
disclosure.  Omit that during enlightenment unless running in
explore mode (or wizard mode).

src/insight.c

@@ -1922,7 +1922,8 @@ attributes_enlightenment(
     }
 #endif
 
-    {
+    /* saving-grace: show during final disclosure, hide during normal play */
+    if (final || wizard || discover) {
         static const char *verbchoices[2][2] = {
             { "might avoid", "have avoided" },
             { "could have avoided", "avoided" },