Index collection prefixes for path correspondence

docs/roadmap/remediation.md

@@ -176,7 +176,15 @@ change was added to provide.
 
 ## Finding 4 — Correspondence lookup repeatedly serializes growing path prefixes
 
-**Priority:** P2. **Status:** Open.
+**Priority:** P2. **Status:** Complete.
+
+Completion: eligible collection prefixes now use the existing prefix index.
+Translation formats the requested pointer once, retains concrete path-kind
+checks, and copies the resulting path independently. No-eligible cases return
+positionally without formatting prefixes; no-registration loads skip matching
+construction entirely. Cloning rebuilds an independently owned index. Existing
+matching/history/ownership coverage and a numeric-key/escaped-key regression
+passed, along with `./scripts/check.sh`.
 
 **Code:** [correspondence translations](../../internal/engine/resolution_correspondence.go),
 `entryPath` at lines 96–125 and `finalPath` at lines 129–156; consumers include