Workflow layer: gates, decisions, lineage audits, workflow test

docs/transformation-implementation.md

@@ -56,6 +56,9 @@ rather than by bypassing existing asset governance.
   available.
 - `DerivedArtifactLineage` persistence and lookup by output asset, source
   asset, or transformation run.
+- `derived_artifact.lineage.linked` audit events connect output assets to
+  transformation runs, source assets, source versions, and output
+  representations.
 - Audit events for queued, started, completed, failed, denied, and canceled
   transformation runs.