First slice of the file-backed IEventStore planned in
cli/plans/2026-04-24-file-event-store-*. Each event is stored as
events/<aa>/<bb>/<id>.json with atomic tmp+rename writes. Ephemeral
kinds are dropped. Duplicate inserts are no-ops (id-level uniqueness).
Staging leftovers are swept on open.
Only id-based query and delete are wired; the query planner, indexes,
replaceable/addressable slots, tombstones, vanish, expiration sweep,
FTS, and transactions land in later steps.
Tests: 10 new tests under quartz jvmTest, all passing.
Claude
3550044ae0