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/content/spawn.rs

@@ -22,6 +22,7 @@ use std::collections::BTreeMap;
 
 use crate::content::loader::{ContentStore, DistrictContent};
 use crate::content::types;
+use crate::knowledge::content_registry::ContentEntityRegistry;
 use crate::knowledge::graph::KnowledgeGraph;
 use crate::knowledge::registry::{EntityRegistry, StableEntityId};
 use crate::knowledge::types::{
@@ -213,6 +214,12 @@ fn spawn_npc(world: &mut World, profile: &types::NpcProfile, result: &mut SpawnR
         ContentSlug(profile.canonical_id.clone()),
     ));
 
+    // Register in ContentEntityRegistry so KnowledgeGrant::Entity can resolve entity_ref strings
+    // (D-079: ContentEntityRegistry populated at NPC spawn time)
+    world
+        .resource_mut::<ContentEntityRegistry>()
+        .register(profile.canonical_id.clone(), stable_id);
+
     result
         .npc_ids
         .insert(profile.canonical_id.clone(), stable_id);
@@ -296,6 +303,7 @@ fn resolve_information(
                         source: KnowledgeSource::Background,
                         state: KnowledgeState::Active,
                         acquired_tick: 0,
+                        disclosure_blocked: false,
                     },
                 )
             })
@@ -648,6 +656,7 @@ mod tests {
     fn create_test_world() -> World {
         let mut world = World::new();
         world.init_resource::<EntityRegistry>();
+        world.init_resource::<ContentEntityRegistry>();
         world
     }