content: HTML escaping at render boundary (String>>htmlEscaped) + 8 tests (238/238)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/content/scoreboard.json

@@ -2,14 +2,14 @@
   "suites": {
     "block": {"pass": 38, "fail": 0},
     "doc": {"pass": 40, "fail": 0},
-    "render": {"pass": 29, "fail": 0},
+    "render": {"pass": 37, "fail": 0},
     "api": {"pass": 26, "fail": 0},
     "store": {"pass": 29, "fail": 0},
     "crdt": {"pass": 34, "fail": 0},
     "sync": {"pass": 14, "fail": 0},
     "fed": {"pass": 20, "fail": 0}
   },
-  "total_pass": 230,
+  "total_pass": 238,
   "total_fail": 0,
-  "total": 230
+  "total": 238
 }