feat(simulation): add storyteller engagement tracking and activation pass

Storyteller chain for Sprint 23 (#570, #571, #572, #579):

- EngagementRecord component: per-NPC observation_time_ticks,
  conversation_count, monologue_trigger_count — incremented by
  perception, dialogue, and monologue systems
- MovementHistoryBuffer resource: ring buffer of player positions
  over last 3000 ticks with npcs_copresent_in_window() query
- Lifecycle rules: single activation per session, no concurrency,
  no cooldown, terminal resolution constants
- activation_pass() system: gate check, proximity query, engagement
  scoring, unentangled-NPC routing, module selection, emits
  TriangleActivatedEvent on 10-tick cadence after contamination

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

server/src/perception/observation.rs

@@ -12,6 +12,7 @@ use crate::knowledge::{
 use crate::perception::cognitive_delay::{CognitiveDelay, PendingRecognition, RecognitionTrigger};
 use crate::simulation::movement::{PlayerCharacter, TilePosition};
 use crate::simulation::time::SimulationTime;
+use crate::storyteller::EngagementRecord;
 
 /// Emit knowledge events for entities entering/leaving the observer's LOS.
 ///
@@ -29,6 +30,7 @@ pub fn emit_observation_events(
     mut event_queue: ResMut<KnowledgeEventQueue>,
     entity_positions: Query<&TilePosition>,
     anomaly_markers: Query<(), With<crate::perception::anomaly::AnomalyMarker>>,
+    mut engagement_query: Query<&mut EngagementRecord>,
 ) {
     let Some(snapshot) = &buffer.snapshot else {
         return;
@@ -61,6 +63,11 @@ pub fn emit_observation_events(
             continue;
         };
 
+        // Increment observation time for engagement tracking (#570)
+        if let Ok(mut record) = engagement_query.get_mut(entity) {
+            record.observation_time_ticks += 1;
+        }
+
         // Get tile position for knowledge tracking
         let Ok(pos) = entity_positions.get(entity) else {
             continue;