Include validator policy in pipeline identity

docs/operations.md

@@ -89,7 +89,10 @@ Treat checkpoint directories as sensitive local state.
 A checkpoint is reused only when its stored status, dependencies, payloads, and
 digests match the current invocation. Changes to input bytes, the resolved
 pipeline, selected lanes, the runtime LLM profile override, or bound reference
-content invalidate reuse.
+content invalidate reuse. The resolved pipeline identity includes effective
+default and explicitly overridden validator chains, so adding, removing,
+reordering, or reconfiguring a validator invalidates checkpoints even when the
+pipeline profile itself is unchanged.
 
 Typed artifact checkpoints additionally record codec-owned bytes, artifact
 kind, schema ID and version, exact schema digest, and media type. A missing or