Why: Fix the exact Agent-Native consumer chain and publish the r0.4 Backend and browser test candidate as a reviewable Dev combination. Evidence: Strict pin preflight, component tests, isolated PostgreSQL, six HTTP/Playwright cases, and make build passed. The full local make test was interrupted by an unrelated concurrent fixed-port collision; this failure and prior pin failures remain in the task card. Exact-HEAD CI and independent review remain pending. Impact: Dev gitlinks and task evidence only; no paid model call or deployment. Refs: U3 r0.4 implementation plan; Agent-Native PR #46; Agent-Squad PR #53; Backend PR #193; Frontend PR #79
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