Select committed validation inputs by module

docs/roadmap/implementation.md

@@ -289,6 +289,14 @@ Use committed files rather than worktree presence. Show that full lookup still
 resolves an excluded module's destination. Metadata-only selection starts no
 batch content reader. Run validation tree/scope tests.
 
+**Completed:** Added a sorted, deduplicated committed input view for the selected
+module and explicit shared files while retaining full-tree reference lookup.
+Nested module boundaries exclude their descendants, vendored modules remain
+included, and shared-file defaults, replacement, empty selection, and missing
+committed files follow the roadmap. Verified root and nested scopes, worktree-only
+file rejection, cross-module references, lazy content reads, `go test ./internal/validation ./internal/candidate .`,
+and `go run ./internal/apicheck`.
+
 ## Stage 5: Apply selected inputs to every optional file check
 
 **Outcome:** Formatting, workspace, local replacement, file-size, and Markdown