Return a 429 for requests from the cloudflare-support-chat.workers.dev Worker

This was a factor in INCIDENT-7622, https://chat.google.com/room/AAQA62fM640/4SgOlopBhVQ/eMKATdwxr6o?cls=10

Author: mhart

apps/docs-vectorize/src/docs-vectorize.app.ts

@@ -53,4 +53,14 @@ export class CloudflareDocumentationMCP extends McpAgent<Env, State, Props> {
 	}
 }
 
-export default createApiHandler(CloudflareDocumentationMCP)
+const apiHandler = createApiHandler(CloudflareDocumentationMCP)
+
+export default {
+	fetch: (req: Request, env: unknown, ctx: ExecutionContext) => {
+		// XXX: Put in place for INCIDENT-7622, https://chat.google.com/room/AAQA62fM640/4SgOlopBhVQ/eMKATdwxr6o?cls=10
+		if (req.headers.get('cf-worker') === 'cloudflare-support-chat.workers.dev') {
+			return new Response(null, { status: 429 })
+		}
+		return apiHandler.fetch(req, env, ctx)
+	},
+}