content: lock op-log block-type coverage (callout/media via store) + 4 tests (746/746)

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

lib/content/scoreboard.json

@@ -31,7 +31,7 @@
     "data": {"pass": 25, "fail": 0},
     "wire": {"pass": 11, "fail": 0},
     "validate": {"pass": 23, "fail": 0},
-    "store": {"pass": 29, "fail": 0},
+    "store": {"pass": 33, "fail": 0},
     "snapshot": {"pass": 20, "fail": 0},
     "crdt": {"pass": 34, "fail": 0},
     "crdt-tree": {"pass": 21, "fail": 0},
@@ -42,7 +42,7 @@
     "md-doc": {"pass": 12, "fail": 0},
     "fed": {"pass": 20, "fail": 0}
   },
-  "total_pass": 742,
+  "total_pass": 746,
   "total_fail": 0,
-  "total": 742
+  "total": 746
 }