Assemble imported sequence-item scopes

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implementation Plan: Sequence Placement and Composition
 
-Status: implementation in progress; stages 1–7 completed.
+Status: implementation in progress; stages 1–8 completed.
 
 ## Purpose and authority
 
@@ -505,6 +505,20 @@ Validation: import/directive/glob/destination/composition tests and
 `./scripts/check.sh`. Completion: private item imports construct the agreed
 records and preserve physical acquisition evidence.
 
+Completion evidence: import declarations now parse per-declaration placement,
+and item imports compose their body and ordinary helpers in a local mapping
+scope before wrapping the completed record. Nested item scopes, glob matches,
+relative and transitive helper destinations, source origins/history, and
+resolved underlay destinations are retained. Configuration documentation
+describes only the implemented import-placement subset; private registration
+controls remain unadvertised. These checks passed with Go `go1.26.9 linux/amd64`:
+
+- `GOTOOLCHAIN=local GOPROXY=off go test ./internal/engine -run 'Import|Directive|Glob|Destination|Compose|NativeFilesystem' -count=1`
+- `GOTOOLCHAIN=local ./scripts/check.sh`
+- `git diff --check`
+
+No environmental limitation affected validation; checks ran on Linux/amd64.
+
 ## Stage 9 — Wire strict policy through the complete loading lifecycle
 
 Scope: ordinary/grouped engine loading and every strict-tier entry point.