KEYSTONE Embed Technical Architecture — 10KB, Zero Dependencies, Self-Contained

The KEYSTONE embed.js widget is 10,110 bytes, self-contained with zero external dependencies, no network calls at runtime, no cookies or localStorage, and all styles inline on scoped elements. The 328 days of puzzle data are baked into the file. The widget creates a single mount element and uses the visitors system clock for day rollover. GPT-5.6 Luna independently verified the no-tracking claims.