fix: add isError: true to mcp security error response

docs/publishing/origin/security.mdx

@@ -28,7 +28,8 @@ if (
         type: 'text',
         text: 'Unauthorized'
       }
-    ]
+    ],
+    isError: true
   }
 }
 ```

examples/mcp-servers/search/src/worker.ts

@@ -83,7 +83,8 @@ export default {
                   type: 'text',
                   text: 'Unauthorized request: must come from Agentic MCP Gateway'
                 }
-              ]
+              ],
+              isError: true
             }
           }
 

todo.md

@@ -3,10 +3,6 @@
 - **MCP**: `https://gateway.agentic.so/@{username}/{project-slug}/mcp`
 - **HTTP**: `GET/POST` `https://gateway.agentic.so/@{username}/{project-slug}/{tool-name}`
 
-## TODO: P0
-
-- consider changing homepage hero CTA to include publishing
-
 ## TODO: MVP
 
 - **website**
@@ -43,6 +39,7 @@
   - add admin-based tags for main page layout (featured, etc)
 - replace render for api and/or add turbo for caching (too slow to deploy)
 - create slack + notifications
+- consider changing homepage hero CTA to include publishing
 
 ## TODO: Post-MVP