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The stack widens migrateWorktreeIdentity to repoint worktreeId inside session rows. That changes what lands on disk with no wire change, which is Rule 3's shape applied to persistence, so it is measured against v1.4.199 rather than reasoned about. Result: new-build state does not break the old build. The old build renames over it without throwing and loses no row; the two row kinds it cannot repoint stay stale, which is exactly what its own renames already produce. The numbers are measured. A first draft asserted the old build repointed no inner rows at all; it repoints two of four, and the probe is what caught that.