chore: hardening emsg read

dist/fortify.es.mjs

@@ -13,9 +13,18 @@ function cfg(obj, key) {
 function clip(s) {
     return String(s).slice(0, 80);
 }
-/** Best-effort error message, tolerant of non-Error throws. */
+/**
+ * Best-effort error message, tolerant of non-Error throws. Must never throw itself: it runs inside
+ * init()'s catch and several sink catches, so a hostile error whose `message` is a throwing getter
+ * must not be able to re-throw from here and brick init(). Falls back to a constant.
+ */
 function emsg(e) {
-    return String(e?.message);
+    try {
+        return String(e?.message);
+    }
+    catch {
+        return 'unknown error';
+    }
 }
 /**
  * Copy an object's own keys, dropping the three that could pollute a prototype. Deliberately not a