feat(simulation): wire Sprint 15 systems + protocol v13

Register all new systems in NpcPlugin and SimulationPlugin with correct
ordering constraints. Protocol bumped to v13: tell_state on VisibleEntity,
follow_state and PostConversationQueue on ObserverSnapshot, Follow verb
on VerbKind. Observer snapshot populates tell state from DerivedTellState
and follow state from FollowTarget. System ordering: tolerance after
mood, deviation after activity, tell after mood+deviation, follow after
visibility geometry, event monologue after conversations.

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

server/src/bridge/text_renderer.rs

@@ -240,6 +240,7 @@ mod tests {
                     visibility: VisibilitySector::Forward,
                     relationship: RelationshipState::Unknown,
                     observation: EntityVisibility::Visible,
+                    tell_state: None,
                 },
                 VisibleEntity {
                     entity_id: 100,
@@ -250,6 +251,7 @@ mod tests {
                     visibility: VisibilitySector::Forward,
                     relationship: RelationshipState::Known,
                     observation: EntityVisibility::Visible,
+                    tell_state: None,
                 },
                 VisibleEntity {
                     entity_id: 200,
@@ -260,6 +262,7 @@ mod tests {
                     visibility: VisibilitySector::Forward,
                     relationship: RelationshipState::Unknown,
                     observation: EntityVisibility::Visible,
+                    tell_state: None,
                 },
             ],
             visible_tiles: vec![VisibleTile {
@@ -302,6 +305,7 @@ mod tests {
             scan_events: vec![],
             conversation_events: vec![],
             conversation_ended: vec![],
+            follow_state: None,
             sound_events: vec![],
             rng_seed: None,
         }
@@ -431,6 +435,7 @@ mod tests {
             scan_events: vec![],
             conversation_events: vec![],
             conversation_ended: vec![],
+            follow_state: None,
             sound_events: vec![],
             rng_seed: None,
         };