feat(simulation): knowledge grant schema, events, and contradiction detection (#545, #546, #547)

KnowledgeGrant untagged enum (Fact + Entity variants), ContentEntityRegistry
resource, KnowledgeGranted event processing, ContradictionClaim struct with
600-tick window detection in observe_entity. Wires knowledge_grant field in
dialogue line selection. Implements D-079, D-083. Closes Q-026.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/perception/interpretation.rs

@@ -208,6 +208,7 @@ mod tests {
         world.insert_resource(WalkabilityMap::new(32, 32, 1));
         world.init_resource::<SnapshotBuffer>();
         world.init_resource::<crate::knowledge::KnowledgeEventQueue>();
+        world.init_resource::<crate::knowledge::ContradictionDetectedQueue>();
         world.init_resource::<EntityRegistry>();
         world.init_resource::<ObservationEventQueue>();
         world.init_resource::<VisibilityGeometry>();