fix(markdown): enforce marked v18 across consumers

Author: waleedlatif1

bun.lock

@@ -122,6 +122,7 @@
     "drizzle-orm": "^0.45.2",
     "postgres": "^3.4.5",
     "minimatch": "^10.2.5",
+    "marked": "18.0.11",
     "mermaid": "11.16.1",
     "zod": "4.3.6",
     "e2b": "2.45.0",