chore(simulation): address review suggestions — comments and minor fixes

- monologue.rs: tracing::warn on unrecognized trigger in fallback arm
- disclosure.rs: borrow-sequencing comment, first() simplification note
- trait_modifiers.rs: delegate parse_confidence to KnowledgeConfidence::try_from
- npc_knowledge_transfer.rs: fix misleading "draw randomly" comment,
  document one-directional transfer behavior
- graph.rs: document intentional no-retrigger after contradiction
- dialogue.rs: explain entity grant guardrail asymmetry (D-079)
- knowledge/mod.rs: document one-tick monologue lag from system ordering
- poi_discovery.rs: document D-079 carve-out for direct KG write

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

server/src/simulation/npc_knowledge_transfer.rs

@@ -197,6 +197,10 @@ pub fn transfer_npc_knowledge(
         }
 
         // --- Dual-mutable KG access ---
+        // Transfer is one-directional per conversation tick: speaker → partner.
+        // If both participants are Active NPCs, each fires as "speaker" in
+        // separate conversation pairs (run_npc_conversations creates symmetric
+        // pairs), so both directions are covered across two iterations.
 
         let Ok([speaker_kg, mut partner_kg]) =
             kg_query.get_many_mut([speaker_entity, partner_entity])
@@ -265,7 +269,8 @@ pub fn transfer_npc_knowledge(
         // Sort by most recently updated (deterministic: descending tick, stable by BTreeMap key order)
         candidates.sort_by(|a, b| b.sort_key().cmp(&a.sort_key()));
 
-        // Draw 1–3 entries
+        // Take top 1–3 entries by recency (random count, deterministic selection).
+        // The random element is HOW MANY facts transfer, not WHICH ones.
         let count = rng.rng.random_range(1u32..=3u32) as usize;
         let count = count.min(candidates.len());