Merge PR #713: add-plugin/postiz into staging

.claude-plugin/marketplace.json

@@ -1262,6 +1262,16 @@
         "sha": "7d7a3f342bbf4d02b6e012279800cf91ff0c1c97"
       },
       "homepage": "https://github.com/nvsecurity/nightvision-skills"
+    },
+    {
+      "name": "postiz",
+      "description": "Social media automation CLI for scheduling posts, managing integrations, uploading media, and tracking analytics across 28+ platforms including X, LinkedIn, Reddit, YouTube, TikTok, Instagram, and more",
+      "source": {
+        "source": "url",
+        "url": "https://github.com/gitroomhq/postiz-agent.git",
+        "sha": "c5d1bf5f7e95a71e230fc19ae2150ddd9c549854"
+      },
+      "homepage": "https://postiz.com/agent"
     }
   ]
 }