Reject trailing record JSON without decoding a second value

docs/roadmap/remediation.md

@@ -493,6 +493,12 @@ changes to record selection are required.
 
 ## R12: Reject trailing JSON without constructing a discarded value — P3
 
+**Completed:** Loading uses complete-document unmarshalling and wraps the actual
+parser error. It avoids constructing a discarded trailing value while retaining
+the whole-file read bound. Tests passed for single documents, whitespace,
+additional fields, extra documents, malformed suffixes, and retained syntax
+causes, alongside byte-preserving record regressions.
+
 **Relevant code:** `internal/publish/record.go:24`, particularly the second
 `decoder.Decode(&trailing)` and its error handling at lines 34–37.