Pass effective destinations through import traversal

docs/roadmap/implementation.md

@@ -169,7 +169,7 @@ Done: baseline and decision are recorded; implemented behavior is unchanged.
 
 ## Stage 2 — Refactor traversal to explicit per-document placement
 
-Status: planned. Scope: private context plumbing; old syntax remains unchanged.
+Status: complete. Scope: private context plumbing; old syntax remains unchanged.
 
 1. Add the relative-destination slot to `importDeclaration`, initially zero for
    all parsed declarations. Add the destination-append helper and bounded
@@ -189,10 +189,17 @@ Status: planned. Scope: private context plumbing; old syntax remains unchanged.
    Public syntax and complete acceptance follow Stage 3.
 
 Validate: `go test ./internal/engine -run 'Import|Glob|Destination|Grouped'`,
-`go test . -run 'Destination|FacadeLayered'`, and `./scripts/check.sh`.
+`go test . -run 'Destination|FacadeLayered|Mapping'`, and `./scripts/check.sh`.
 Done: baseline loads remain equivalent; all placement consumers use explicit
 document context and no uniform setter can erase per-import placement.
 
+Evidence (2026-10-14): based on `a8beb3e62014cb960f3c922c79cd98bd04a657e7`,
+using `go1.26.8 linux/amd64`. The focused engine command, the root destination,
+layered, and Mapping regression tests, and `./scripts/check.sh` all passed. The
+private traversal fixture verifies nested accumulation, sibling isolation, and
+one shared destination across glob matches; failure fixtures verify entry
+placement survives import-context and imported-parse errors. No limitations.
+
 ## Stage 3 — Accept and document the selected YAML syntax
 
 Status: planned. Scope: directive parsing and first complete public behavior.