Cleanup and complete the validator refactor

docs/roadmap/implementation.md

@@ -1,16 +0,0 @@
-# Validation Refactor Implementation
-
-The validation refactor described by this temporary implementation plan has
-been completed.
-
-Current behavior is documented in:
-
-- [Configuration](../config.md)
-- [CLI Reference](../cli.md)
-- [Pipeline Internals](../internal/pipeline.md)
-- [Modules](../internal/modules.md)
-- [JSON Output](../integrations/json-output.md)
-- [Troubleshooting](../troubleshooting.md)
-
-Remaining future validation ideas, if any, belong in
-[Validation Roadmap](validation.md).