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usc FCM-M4-001 repair advanced: complete production-v1 remote targeting/socket parity tree 3662f7cfa02d258833f3a54e12e4a5aa6f71ddb7 passed immutable review, 71 focused tests, and typecheck. Hooks committed exact tree as 66ac59af49266175d9da8fe860006c53823d3283; unchanged-main queue check passed; existing PR #788 now points to that head after pre-push typecheck/lint/format. Fresh exact-head RoR and CI are running. Merge, M4-002, migration/canary/site/runtime/live action, and #758 closure remain held.