Add loadRejectsIncompatibleVersion test asserting SaveException on schema
version 999, assert derived slug in listReturnsSlotMetadata, and harden
save() to delete the orphaned .tmp file when the non-atomic fallback move
also fails before re-throwing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Reorder apply() so visitedRoomIds is restored before setCurrentRoom() is
called, ensuring the current room is never accidentally stripped from the
visited set by the subsequent clear(). Also adds a post-condition assertion
to applyToleratesMissingCollections that proves null roomItemIds leaves
room item tables empty after apply.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
