Reuse validated filesystem facts through acquisition

docs/internal/imports.md

@@ -8,8 +8,9 @@ This note records implementation flow and private identities for maintainers.
 
 Each source's root directive is parsed into presence-aware declarations and
 resolved against load-wide defaults. `acquisition.go` owns shared acquisition
-policy, load accounting, and per-tier accounting; `import_acquisition.go` owns
-reading candidate bytes, declaration traversal, and import admission. Candidate
+policy, load-wide accounting, and tier-scoped repetition/namespace state;
+`import_acquisition.go` owns reading candidate bytes, declaration traversal,
+and import admission. Candidate
 selection in `import_selection.go` preserves a normalized
 namespace path separately from canonical access identity: overlapping roots
 coalesce the same candidate spelling in that namespace, while aliases reached