pass 2

docs/subsystems/RuntimeSnapshotProvider.md

@@ -481,7 +481,7 @@ Recommended tests:
 Its contract is:
 
 - build from store-owned state
-- publish immutable or near-immutable render snapshots
+- publish immutable or near-immutable render snapshots; the current implementation keeps the last matching versioned snapshot in `RuntimeSnapshotProvider`
 - version them explicitly
 - keep frame-local timing separate
 - give render a cheap, lock-light read path

docs/subsystems/RuntimeStore.md

@@ -405,7 +405,7 @@ Initial likely contents:
 - preset load/save access
 - package catalog read access
 
-At this stage, `RuntimeHost` may still be the implementation behind the façade.
+This stage is now past the initial compatibility point: `RuntimeStore` owns its durable/session backing fields directly rather than wrapping a `RuntimeHost` object.
 
 ### Step 2: Move Pure Persistence Helpers First