Clarify FlowBench Harbor scoring boundary

harbor/README.md

@@ -14,9 +14,9 @@ Files intentionally excluded from this public package:
 - strict verifier expected files
 - model result logs and generated transcripts
 
-Official benchmark scores should be computed with a private evaluator pack or a
-freshly generated held-out split. Publishing fixed labels for the official split
-would make hard-coded benchmark submissions possible.
+Official-style or private benchmark scores should be computed with a private
+evaluator pack or a freshly generated held-out split. Publishing fixed labels
+for the official split would make hard-coded benchmark submissions possible.
 
 For public runs, freeze prompts and adapters before scoring and reject
 task-id-specific lookup logic. Public Harbor results are smoke-test results, not