{"id":"free-list-layout-coupled","text":"`allocate_page` and `free_page` share an implicit contract on free-list node layout (3-byte zeroed header + 4-byte big-endian next-pointer); neither validates the other's output, so a format change in one silently breaks the other","truth_value":"IN","source":"entries/2026/05/28/b-tree-storage-engine-btree-allocate_page.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"free-list-layout-coupled","truth_value":"IN","reason":"premise"}]}}