Verify mounted provenance and resource contexts

docs/roadmap/implementation.md

@@ -342,7 +342,7 @@ budgets and introduces no unrelated caps.
 
 ## Stage 8 — Preserve provenance, history, and source resource contexts
 
-Status: planned. Scope: engine inspection and retained evidence.
+Status: complete. Scope: engine inspection and retained evidence.
 
 1. Audit `compositionOrigins`, `completeCompositionOrigins`, application replay,
    metadata construction/finalization, and source-record cloning against placed
@@ -359,9 +359,18 @@ Status: planned. Scope: engine inspection and retained evidence.
    inspect each source record, and verify independent destination paths. Repeat
    inspection after comparison and independent loads to detect retained mutation.
 
-Validate: destination/metadata/provenance/history/resource tests,
-`go test -race ./internal/engine`, and everyday check. Done: inspection explains
-effective placement and physical origin without consumer reconstruction.
+Validated with `go test ./internal/engine -run 'Destination|Metadata|Provenance|History|Resource|SourceContext'`,
+`go test -race ./internal/engine`, and `./scripts/check.sh` (go1.26.8
+linux/amd64); all passed. `TestLayeredDestinationsRetainOriginsHistoryAndDetachedRecords`
+checks synthetic-container fallback locations, authored leaf coordinates,
+composite origins, removed-descendant history, and the same host file retained
+at distinct destinations in separate tiers before and after comparison and an
+independent load. `TestLayeredImportedInheritedValuesRetainResourceContexts`
+uses real temporary files to verify resolution-time and completed-result
+relative-resource lookup through an imported surviving parent and its inherited
+child. Existing metadata and resource-context tests continue to cover detached
+records and loading-handle closure. Done: inspection explains effective
+placement and physical origin without consumer reconstruction.
 
 ## Stage 9 — Verify final inheritance, sensitivity, and lifecycle integration