Changes touching this path

• a per-change cost inside the repo open stops being unmeasurable, because the open now has a depth axis beside #1545's width axis: a --graph-load half over a chain of N changes, whose control refuses a depth-1 fixture outright instead of letting it report the absence of a workload as the absence of an effect, which is what parked #1547 and #1548 while both were correct (#1571) 10730151 · dbf3dbe6…

Renames are not followed. loot's tree maps a path to an address, so a rename is a delete and an add. This list is the history of the name, not of the bytes.