Document scene-aware combat extraction

docs/roadmap/future.md

@@ -18,10 +18,6 @@ not as committed release dates.
 
 ### Use D&D Scene Chunking
 
-- Allow the combat extractor to no-op for chunks classified as non-combat only
-  after the scene-description artifact can be supplied through an explicit
-  ordered dependency. Do not make generic chunk materialization depend on a D&D
-  classification.
 - Use ordered pipeline steps whenever a later artifact needs an accepted
   earlier artifact as context. Keep independent lanes in the same step and do
   not introduce a general DAG or concurrent cross-lane reconciliation model.