fix(simulation): review fixes — walk-away source and Loyal trait filter

record_incomplete_interaction now uses Heard/Close source instead of
DirectObservation, preventing false inoculation against contradiction
detection. Wired exclude_high_trust_entities (Loyal trait) filter into
derive_disclosure_candidates — facts from Friendly-relationship source
entities are excluded from disclosure pool.

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

server/src/knowledge/graph.rs

@@ -210,7 +210,14 @@ impl KnowledgeGraph {
                 last_observed_tick: 0,
                 last_updated_tick: 0,
                 confidence: KnowledgeConfidence::Suspects,
-                source: KnowledgeSource::DirectObservation { tick },
+                // Heard/Close — not DirectObservation, because walk-away is
+                // not a confirmed sighting. Using DirectObservation here
+                // would falsely inoculate the entry against contradiction
+                // detection (pre-overwrite check only fires on ToldBy source).
+                source: KnowledgeSource::Heard {
+                    tick,
+                    range: super::types::SoundRange::Close,
+                },
                 state: KnowledgeState::Active,
                 relationship: RelationshipState::Unknown,
                 known_attributes: BTreeMap::new(),

server/src/npc/disclosure.rs

@@ -16,7 +16,7 @@ use crate::bridge::types::MonologueEvent;
 use crate::knowledge::events::{
     KnowledgeEvent, KnowledgeEventType, ProcessedFactGrant, ProcessedKnowledgeGrant,
 };
-use crate::knowledge::types::{FactId, KnowledgeConfidence, KnowledgeSource, KnowledgeState, StableId};
+use crate::knowledge::types::{FactId, KnowledgeConfidence, KnowledgeSource, KnowledgeState, RelationshipState, StableId};
 use crate::knowledge::{KnowledgeEventQueue, KnowledgeGraph, StableEntityId};
 use crate::npc::mood::{MoodState, NpcMood};
 use crate::npc::relationships::RelationshipGraph;
@@ -162,6 +162,11 @@ pub fn derive_disclosure_candidates(
                 .is_some_and(|m| m.stage1.exclude_told_by)
         });
 
+        // Loyal trait: exclude facts sourced from high-trust entities.
+        // "Don't gossip about your friends" — if ToldBy source has Friendly
+        // relationship in this NPC's KG, suppress the fact. D-081.
+        let exclude_high_trust = trait_config.any_excludes_high_trust(&trait_keys);
+
         let mut pool: Vec<(FactId, u64, KnowledgeConfidence)> = kg
             .known_facts_iter()
             .filter(|(fact_id, fact)| {
@@ -185,6 +190,14 @@ pub fn derive_disclosure_candidates(
                 if exclude_told_by && matches!(fact.source, KnowledgeSource::ToldBy { .. }) {
                     return false;
                 }
+                // Loyal: skip facts from high-trust (Friendly) source entities.
+                if exclude_high_trust {
+                    if let KnowledgeSource::ToldBy { source_id, .. } = &fact.source {
+                        if kg.relationship_with(source_id) == RelationshipState::Friendly {
+                            return false;
+                        }
+                    }
+                }
                 true
             })
             .map(|(id, fact)| (id.clone(), fact.acquired_tick, fact.confidence))