refactor(updates): use useragent event field

packages/updates/README.md

@@ -21,7 +21,7 @@ The Worker has `workers_dev` and preview URLs disabled so the custom hostname is
 Every request reaching the Worker emits an unsampled event at request start to the shared production
 Cloudflare lake stream through the `EVENTS` Pipelines binding. Events use
 `source: "update"`, `type: "request"`, an ISO `timestamp`, and a `payload` containing
-the method, path, `user_agent`, `ip` (from Cloudflare's `CF-Connecting-IP` header),
+the method, path, `useragent`, `ip` (from Cloudflare's `CF-Connecting-IP` header),
 country, and Cloudflare colo. Query strings, request bodies, cookies, and authorization
 headers are not included. Response status and duration are not recorded.
 

packages/updates/src/index.ts

@@ -44,7 +44,7 @@ export default {
           payload: {
             method: request.method,
             path: url.pathname,
-            user_agent: request.headers.get("user-agent"),
+            useragent: request.headers.get("user-agent"),
             ip: request.headers.get("cf-connecting-ip"),
             cf_country: request.cf?.country,
             cf_colo: request.cf?.colo,