Departures from the Build text, one bullet each: no golden sha to recompute, invoice_document's dropped `today`, where the ways to pay, the footer and the website come from, exact unit prices, the handbook steps the earlier slices had already written, the viewer parity test's shape, and the bookspec index left to P13. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp