Changes touching this path

• an offer-corpus harness measures loot's own history, where a delta-scoped offer already carries the whole tip tree (#803) 8139603c · dbf3dbe6…
• the change graph gets one read view, and the two forwarding bands over it retire (#868) 826c3339 · dbf3dbe6…diff

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.