Fix @astrojs/mdx to v5 for Astro 6 compatibility

.omc/state/agent-replay-47a38a07-3b39-4e33-8da2-ad3c7604975c.jsonl

@@ -0,0 +1 @@
+{"t":0,"agent":"acc8212","agent_type":"unknown","event":"agent_stop","success":true}

.omc/state/last-tool-error.json

@@ -0,0 +1,7 @@
+{
+  "tool_name": "WebFetch",
+  "tool_input_preview": "{\"url\":\"https://www.npmjs.com/package/@astrojs/mdx\",\"prompt\":\"What are the latest stable versions of @astrojs/mdx and which Astro versions are they compatible with?\"}",
+  "error": "timeout of 60000ms exceeded",
+  "timestamp": "2026-04-27T12:22:43.727Z",
+  "retry_count": 1
+}

.omc/state/subagent-tracking.json

@@ -0,0 +1,7 @@
+{
+  "agents": [],
+  "total_spawned": 0,
+  "total_completed": 0,
+  "total_failed": 0,
+  "last_updated": "2026-04-27T12:19:39.595Z"
+}

package.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "@astrojs/check": "^0.9.4",
-    "@astrojs/mdx": "^3.1.9",
+    "@astrojs/mdx": "^5.0.4",
     "@tailwindcss/typography": "^0.5.15",
     "@tailwindcss/vite": "^4.0.0",
     "astro": "^6.1.7",