Cleanup and complete the validator refactor

docs/roadmap/future.md

@@ -22,6 +22,16 @@ future work only.
 - Cross-chunk semantic deduplication.
 - Additional validator packages and production default chains for future
   modules.
+- Production LLM-backed validators when there is a concrete review policy that
+  benefits from model judgment.
+- Validator diagnostics and timing summaries if operators need more detail than
+  `manifest.json`, `rejected.json`, and `warnings.json` provide.
+- Media-type validators for non-JSON module outputs when such modules are
+  introduced.
+- Validator compatibility metadata if real deployments need config-time
+  enforcement that a validator is suitable for a specific stage or module.
+- Batching or context-window controls for LLM-backed validators if validator
+  inputs become large enough to require them.
 - Parallel execution where it preserves deterministic manifests and diagnostics.
 - Additional output encoders.