Simplify NPC normalization prompt guidance

docs/internal/llm.md

@@ -157,18 +157,18 @@ messages remain canonical shared assets rather than copied package text.
 ### D&D NPC Normalization Prompt Ordering And Cache Boundaries
 
 NPC normalization has a distinct prompt and response-schema identity from NPC
-extraction. Its stable message tiers are the common D&D system and identity
-assets, followed by package-owned task and normalization instructions. Cache
-boundaries follow the shared identity tier and the package instructions. The
-variable tail contains the private candidate-name-and-range input and a
-windowed transcript input whose cited units provide local context; neither has
-a cache boundary because it changes with the document.
+extraction. Its stable message tiers are the common D&D system asset, followed
+by package-owned task and normalization instructions. Cache boundaries follow
+the shared system tier and the package instructions. The variable tail contains
+the private candidate-name-and-range input and a windowed transcript input
+whose cited units provide local context; neither has a cache boundary because
+it changes with the document.
 
-This prompt intentionally omits extraction-evidence and campaign-reference
-assets: it reconciles existing records rather than extracting events or adding
-evidence. Its package-owned manifest and schema identity are fingerprinted
-separately, so a normalization prompt or schema change cannot reuse a prior
-normalization checkpoint.
+This prompt intentionally omits shared identity guidance,
+extraction-evidence, and campaign-reference assets: it reconciles existing
+records rather than extracting events or adding evidence. Its package-owned
+manifest and schema identity are fingerprinted separately, so a normalization
+prompt or schema change cannot reuse a prior normalization checkpoint.
 
 Shared wording belongs in the canonical assets under
 `internal/modules/dnd/shared`; extraction packages reference those assets in