engine and lifecycle

docs/successor-boundary-interface-map.md

@@ -101,15 +101,17 @@ Responsibilities:
 
 ### Repository Adapter
 
-Planned module:
+Current module:
 
 ```text
-src/infospace_bench/repository.py
+src/infospace_bench/engine.py
 ```
 
 Responsibilities:
 
 - provide local file-backed artifact reads/writes
+- expose an `AssetRepository` protocol
+- provide `LocalAssetRepository` as the default adapter
 - later provide `kontextual-engine` backed asset lookup/sync
 - expose dry-run sync plans before mutation
 - keep provenance and digest handling explicit