ADR-003 formalises the 5-repo structure aligned with OAS Stack S1-S5: railiance-infra, railiance-cluster, railiance-platform, railiance-enablement, railiance-apps. Defines boundary rule, pre-condition chain, and content relocation table. ADR-002 marked superseded. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>