Document D&D enemy event artifacts

docs/roadmap/future.md

@@ -7,24 +7,6 @@ not as committed release dates.
 
 ## Near-Term D&D Pipeline
 
-### Combat Enemy Ledger
-
-- Add a D&D artifact that identifies enemies faced during combat and supports
-  an end-of-session encounter ledger.
-- Track each enemy's observed state using a small controlled vocabulary such as
-  `active`, `killed`, `fled`, `captured`, or `incapacitated`, while preserving
-  an explicit unresolved state when the transcript does not establish an
-  outcome.
-- Preserve the evidence for enemy participation and state changes rather than
-  inferring a terminal outcome from combat ending or an enemy disappearing
-  from the conversation.
-- Define how repeated mentions, groups of unnamed enemies, summoned or allied
-  creatures, and the same enemy appearing in multiple combats affect identity
-  and ledger entries.
-- Evaluate whether the ledger should be extracted directly, derived from
-  combat-turn artifacts, or use a sequential pipeline that consumes combat
-  turns and the normalized NPC registry as grounding references.
-
 ### Location Extraction
 
 - Add a D&D artifact for locations visited by the party or otherwise mentioned