feat(simulation): protocol v14 — POI list, examine result, player knowledge wire types

Add three new ObserverSnapshot fields for client Sprint 18 tickets:
poi_list (Vec<PoiWire>) for minimap #151, examine_result
(Option<ExamineResultWire>) for #174, player_knowledge
(Option<PlayerKnowledgeWire>) for journal #264. POI list populated
live from KG-discovered PointOfInterest components. KG dump
serializes entity/fact knowledge with confidence, source, and state.

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

server/src/bridge/text_renderer.rs

@@ -308,6 +308,9 @@ mod tests {
             follow_state: None,
             sound_events: vec![],
             rng_seed: None,
+            poi_list: vec![],
+            examine_result: None,
+            player_knowledge: None,
         }
     }
 
@@ -438,6 +441,9 @@ mod tests {
             follow_state: None,
             sound_events: vec![],
             rng_seed: None,
+            poi_list: vec![],
+            examine_result: None,
+            player_knowledge: None,
         };
         let text = format_snapshot_text(&snap);
         assert!(text.contains("Tick 0"));