content: asSx wire string-escaping (String>>sxEscaped) + 5 tests (243/243)

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": 37, "fail": 0},
+    "render": {"pass": 42, "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": 238,
+  "total_pass": 243,
   "total_fail": 0,
-  "total": 238
+  "total": 243
 }