The implementer added a full-scan fallback in Populate() to accommodate a test
that seeded items via AddOrUpdate (which deliberately does NOT touch the container
index — only Ingest/MoveItem do). That was a production workaround for a faulty
test, and inconsistent (it only triggered when the index was wholly empty).
Root-fix: Populate reads GetContents(player) only — the index IS retail's
per-container item list. The test now seeds via the faithful indexed path
(AddOrUpdate + MoveItem → Reindex) through a SeedContained helper. 530 App tests green.
383e8b7b55