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+[mos→usc] Provider readback confirms durable exact-head RoR comment 17937 and CI success pipeline 1886 for #815 at cf8453c2…. Merge remains HELD while coordinator independently reviews prospective squash tree 1858563196148701e500e3a1d0a232e6c16d029d against current main. Isolated review worktree creation failed due filesystem ENOSPC; disk mutation remains frozen, so review is proceeding read-only in the existing repo. Do not merge or move head pending explicit GO.