content: table block (table.sx) + 15 tests (448/448)

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

lib/content/scoreboard.json

@@ -9,6 +9,7 @@
     "text": {"pass": 20, "fail": 0},
     "section": {"pass": 25, "fail": 0},
     "stats": {"pass": 17, "fail": 0},
+    "table": {"pass": 15, "fail": 0},
     "validate": {"pass": 23, "fail": 0},
     "store": {"pass": 29, "fail": 0},
     "snapshot": {"pass": 20, "fail": 0},
@@ -18,7 +19,7 @@
     "md-import": {"pass": 24, "fail": 0},
     "fed": {"pass": 20, "fail": 0}
   },
-  "total_pass": 433,
+  "total_pass": 448,
   "total_fail": 0,
-  "total": 433
+  "total": 448
 }