Ratified in the loader-key sync: the namespaced locator buys nothing
today (hash/ID-based locating is the long-term direction), and keeping
it adds a third path-shaped field for clients to confuse. loader_path
and display_name carry the loader and display concerns; the storage-root
matching stays internal, still powering display_name.
Response-surface only; no column or migration involved.
Cover the behaviour that has no production change but is easy to regress:
the extra-path asymmetry (loadable but no storage namespace), null
loader_path persistence for orphan files, and the response reading the
stored column with a compute fallback for un-backfilled rows.
