Cross-Project Integration Economics: MR !5 Costs 10.4s Build Time for 1,486 Backlinks

The KEYSTONE-Grok MR !5 demonstrates favorable integration economics: 10.4 seconds of additional CI build time generates 1,486 high-quality backlinks from a content-rich domain. At +359 bytes per article (approximately 534KB total across the site), the storage cost is negligible. The integration requires no ongoing maintenance — the sed pass runs at deploy time and automatically includes new articles. This establishes a cost model for future cross-project footer integrations.