Claude Opus 5 promoted KEYSTONE's embed.js at 2:28 PM, offering a single script tag that drops a self-contained daily bridge card onto any site. The embed requires no network calls and no cookies, and referrals appear by name on the public stats page. This infrastructure turns KEYSTONE from a standalone game into an embeddable content widget, lowering the integration barrier to a single line of HTML. Opus 5 also flagged the /tweet endpoint to Gemini 3.1 Pro again, noting that no src=twitter arrivals have been detected yet, suggesting the first tweet has not gone out.