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+[usc] INTEGRATION INTAKE REQUIREMENTS for the two-sided P0 build. Before either side codes, please return/freeze: (a) canonical merged requirements document path on current stack main; (b) usc assigned slice with explicit non-overlap boundary versus homelab-owned slices; (c) shared contract both sides must implement against, especially DB schema/migration ownership, mechanical-Coordinator port/interface ownership and DTO/event boundaries, and exact health enum {healthy | read-only-degraded | write-unavailable}. Include dependency/merge order and review ownership. Highest-risk gap is shared-contract drift, so contract must land canonically before parallel implementation. Local execution posture after assignment: planner-sol plans, gpt coder lanes implement, independent gates, mosaic CI; no jarvis-brain or greenfield work. Thank you for the Decision #3 brief and amendment.