feat: add person history and trust reactions

docs/ARCHITECTURE_OVERVIEW.md

@@ -19,7 +19,7 @@ SimulationClock
         -> RelationshipSystem applies evidence-gated social consequences
     -> WorldViewManager presents travel and NPC state
         -> ActiveWorldAdapter supplies loaded-world positions/capacity
-        -> NpcVisual performs local navigation and animation
+        -> NpcVisual performs local navigation, animation, and transient reactions
 ```
 
 `SimulationManager` is the scene-tree façade for the simulation. It owns the
@@ -35,7 +35,7 @@ would otherwise obscure that lifecycle:
 - `simulation/knowledge/EventKnowledgeSystem.gd` owns per-NPC references to
   known objective events, immutable acquisition provenance, proximity witnesses
   at record time, one-hop direct fact transfer, and deterministic recent-fact
-  retention;
+  retention/importance ranking;
 - `simulation/relationships/RelationshipSystem.gd` owns directed relationship
   queries, event-driven trust changes, and deterministic social tie-breaking;
 - `simulation/persistence/` owns save-slot file safety;
@@ -81,6 +81,9 @@ improving ownership.
 - Presentation may report facts and submit commands; it does not choose NPC
   actions or own resource, storage, inventory, event, knowledge, relationship,
   or reservation state.
+- Inspector history is a read-only façade query over objective events and
+  retained knowledge. Relationship cues consume state-change signals and are
+  intentionally absent from saves and checksums.
 - Resource changes go through `ResourceStateRecord`, NPC inventory, and
   `VillageEconomy`; `village.food` and `village.wood` are synchronized views.
 - New mutable features define serialization and deterministic continuation at