Changes touching this path

• loot count-objects lands, and the constraint it is built under is that its number has to be the number gc acts on rather than a second opinion about it: the unreachable count and the reclaim figure are gc OWN pruner and sweeper called with dry_run, over a keep set extracted out of gc as DagRepo::gc_keep_set the way 1505 pulled fold_onto out of converge, so a census that disagrees with a collection is not a thing that can be written, and the pin measures a store, really collects it, then asserts the two halves and the sum all match. One premise of the ticket was wrong in the direction that saved work: nothing reported how large a store is as a VERB, but the totals half was already factored, since RepoStore::objects_size has been the perf record load-bearing counter since 632, so this adds no third walk of the object directory at all, it adds a caller. The extraction surfaced something gc had been getting away with: its keep set was position-dependent, because the primary own working change is the one root in neither the shared graph file nor the lane registry and verify has been adding it by hand since 1309. gc could not notice, since it refuses from anywhere but the primary, where those oids ride in the loaded graph anyway; a read-only census can run from a lane, so the root moved into the shared function and the answer stopped depending on who asks. Machine output is this verb product rather than a garnish, which is why the porcelain is one row per metric keyed by a leading mark instead of one wide row: ADR 0023 makes a column unaddable, and a census is the shape most likely to be asked for one more number. The anti-vacuity pin is the same fixture reading 1 and then 0 with nothing changed but a change naming the orphan, and the read-only pin fingerprints every file under .loot rather than trusting the op log, which would never have shown a pruned object. On this lane own store it reads 7910 objects at 146.7 MiB with 2330 of them unreachable at 36.9 MiB, which is the 1524 baseline (#1523) f10ba1d9 · 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.