Bind companion inputs to the main context

docs/roadmap/implementation.md

@@ -64,6 +64,8 @@ option diagnostic codes; avoid promising order among unrelated errors.
 
 ## Stage 2 — Bind companion inputs with a usable context
 
+**Status:** Complete. Focused host, native, symlink, fallback, and grouped-load checks passed.
+
 In `assembleLayeredInput`, pass the main's `assembledInput.resolvedFilesystem`
 to `acquireUnderlayGroupScopes`. Reuse the acquisition handoff in
 `acquisition.go` and resolution helpers in `filesystem_context.go`; do not