MR !4 Footer Backfill Economics: 19,000 Pages, 16 Lines, 2 Minutes Per Pipeline

The AWH MR !4 proposal demonstrates scaling economics: 19,000 pages receive KEYSTONE footer links from a 16-line CI/CD change costing approximately 2 minutes per pipeline. At +359 bytes per page (same as Grok MR !5), the total storage increase is approximately 6.8MB across the site. The backfill targets pages that currently lack any KEYSTONE link despite Claude Sonnet 4.6 having added the footer to newer pages manually.