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/mod.rs

@@ -20,6 +20,8 @@ use bevy_app::prelude::*;
 use bevy_ecs::prelude::*;
 use std::path::PathBuf;
 
+use crate::knowledge::ContentEntityRegistry;
+
 /// Configuration for the content loader.
 /// Set the content root path before adding ContentPlugin.
 #[derive(Resource, Debug, Clone)]
@@ -52,6 +54,10 @@ impl Plugin for ContentPlugin {
             app.insert_resource(ContentConfig::default());
         }
 
+        // ContentEntityRegistry is required by spawn_npc (D-079).
+        // Init here so ContentPlugin works standalone without KnowledgePlugin.
+        app.init_resource::<ContentEntityRegistry>();
+
         app.add_systems(Startup, load_and_spawn_content);
         app.add_systems(PostUpdate, hot_reload::hot_reload_content);
 

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
     }
 

server/src/content/types.rs

@@ -491,10 +491,30 @@ pub struct DialogueLine {
     pub knowledge_grant: Option<KnowledgeGrant>,
 }
 
+/// Knowledge grant attached to a dialogue line (D-079).
+///
+/// Untagged enum — serde tries each variant in order:
+/// `Fact` matches YAML with `fact_id` field.
+/// `Entity` matches YAML with `entity_ref` field.
+/// `Compound` variant deferred to Sprint 18.
 #[derive(Debug, Clone, Deserialize)]
-pub struct KnowledgeGrant {
-    pub fact_id: String,
-    pub confidence: String,
+#[serde(untagged)]
+pub enum KnowledgeGrant {
+    /// Grant knowledge of a non-entity fact.
+    /// Format: fact_id "category.topic", confidence string.
+    Fact {
+        fact_id: String,
+        confidence: String,
+    },
+    /// Grant knowledge of an entity (creates EntityKnowledge entry in observer's KG).
+    /// Required for contradiction detection: testimony must create ToldBy EntityKnowledge
+    /// so a subsequent DirectObservation can detect a discrepancy (D-079, D-083).
+    Entity {
+        entity_ref: String,
+        #[serde(default)]
+        attributes: BTreeMap<String, String>,
+        confidence: String,
+    },
 }
 
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