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/hack.c

@@ -4049,8 +4049,9 @@ saving_grace(int dmg)
            we might invent one, or perhaps use LL_LIFESAVE, but surviving
            certain death (or preserving worn amulet of life saving) via
            saving-grace feels like breaking a conduct; not sure how best
-           to phrase this though... */
-        livelog_printf(LL_CONDUCT, "%s (%d damage, %d/%d HP)",
+           to phrase this though; classifying it as a spoiler will hide it
+           from #chronicle during play but show it to livelog observers */
+        livelog_printf(LL_CONDUCT | LL_SPOILER, "%s (%d damage, %d/%d HP)",
                        "survived one-shot death via saving-grave",
                        dmg, u.uhp, u.uhpmax);
 

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" },