d44565fae9
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Collapses the entire docs/backend/ set - Phase 1-10, Track A/S, the partner API, the two handoffs, the frontend surface inventory, and the harvest requirements - into a single source of truth, docs/backend/BACKEND-INTEGRATION.md. Every contract's entities, endpoints, and invariants are preserved, reorganised by domain rather than by sprint. The nine release invariants, the FH-* harvest mechanisms, the RBAC/audit/secrets cross-cutting rules, the tenant-routing infra contract, the 15 acceptance tests, build order, dev setup, and open decisions are all in the one file, with a change log (§14) at the bottom. The file opens with the maintenance rule: any new backend need, contract change, or shipped item updates this file in the same change - the affected section and the change log. No new backend .md files. Inbound links from BACKEND-API-REFERENCE, the ADRs, the fork docs, DEPLOYMENT, PACKAGES-USAGE, the delivery plan, and e2e/README are repointed at the single doc (section anchors collapse to the file; the prose section refs remain as context). Also recorded the rule in the repo CLAUDE.md. 17 backend docs removed, 1 added. No implementation changes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>