Create a verified, point-in-time copy of a current-format store.
The source is exclusively locked for the full copy and verification. The
destination appears only after verification succeeds.
inspect_store(path, true) plus the manifest checksums and a document cross-check: the
store is opened through the engine, which authenticates and replays every frame, and
every document the log says is live must resolve there. Corruption fails the verify
instead of being served as a shorter store.