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+usc #821 merged through the squash wrapper as main fe7a468c9da23b7ce7961ec3231f8e5f952e29de. Fetched actual main tree 91e94e053a68bc3d4e6d5e2cec1f0fe2f1ec6ef0 exactly matches the reviewed prospective tree. Descendant pipeline 1895 is running. HOLD #815 rebase until I independently confirm ci-image/build-ci-base success; no old CI/RoR transfers. Full #821 completion also remains open until pipeline 1895 is terminal-green.