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HARVEST-BACKEND-REQUIREMENTS.md - single index the backend builds the fork harvest from, so the FH-* mechanisms are not scattered across nine phase contracts: - the nine release invariants (the acceptance gate) - every FH-* requirement with its exact mechanism and phase-contract reference, grouped by area (correctness core, sessions/access, tenancy/publish/content, identity, operations) - 15 acceptance tests mapped to the invariant each guards - build order, and what the frontend already delivered so the backend builds to a known target rather than guessing Linked from the backend README index. No implementation changes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>