feat(simulation): add NPC name masking with role labels and color index

Server-side infrastructure for information asymmetry in dialogue.
NPCs display role labels (Worker, Supervisor, Patron) instead of
real names until the player explicitly learns them via KG lookup.
NpcColorIndex (stable_id % 8) persists across name reveal.

ConversationEvent and DialogueResponseEvent carry display names +
color indices on the wire with serde(default) for compat.

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

server/src/simulation/dialogue.rs

@@ -21,6 +21,7 @@ use bevy_ecs::prelude::*;
 use rand::Rng;
 
 use crate::bridge::types::{DialogueResponseEvent, MonologueEvent, RelationshipState};
+use crate::simulation::conversation::{display_label_for_role, NpcColorIndex, NpcName};
 use crate::content::line_pool::{
     AccessTier, IndexedDialogueLine, Mood, Situation, Topic, TrustTier,
 };
@@ -360,7 +361,13 @@ pub fn process_talk_interaction(
         ),
         With<PlayerCharacter>,
     >,
-    mut npc_query: Query<(&DialogueProfile, Option<&CurrentMood>, Option<&mut InteractionMemory>)>,
+    mut npc_query: Query<(
+        &DialogueProfile,
+        Option<&CurrentMood>,
+        Option<&mut InteractionMemory>,
+        Option<&NpcName>,
+        Option<&NpcColorIndex>,
+    )>,
 ) {
     let Some(line_pool) = line_pool else {
         return;
@@ -380,8 +387,10 @@ pub fn process_talk_interaction(
 
     let target = talk_request.target;
 
-    // Look up NPC dialogue profile, mood, and interaction history (#325)
-    let Ok((profile, mood_opt, mut interaction_mem_opt)) = npc_query.get_mut(target) else {
+    // Look up NPC dialogue profile, mood, interaction history, name, and color (#325)
+    let Ok((profile, mood_opt, mut interaction_mem_opt, npc_name_opt, color_idx_opt)) =
+        npc_query.get_mut(target)
+    else {
         tracing::debug!(
             "Talk target {:?} has no DialogueProfile — cannot select dialogue",
             target
@@ -479,10 +488,27 @@ pub fn process_talk_interaction(
             return;
         };
 
+        // Resolve speaker display name: use real name if player KG has "name"
+        // attribute for the target, otherwise fall back to role label.
+        let speaker_display_name = {
+            let known = observer_kg
+                .entity_knowledge(&speaker_stable)
+                .map(|e| e.known_attributes.contains_key("name"))
+                .unwrap_or(false);
+            if known {
+                npc_name_opt.map(|n| n.0.clone()).unwrap_or_else(|| "Unknown".to_string())
+            } else {
+                display_label_for_role(&profile.role)
+            }
+        };
+        let speaker_color = color_idx_opt.map(|c| c.0).unwrap_or(0u8);
+
         response_buffer.response = Some(DialogueResponseEvent {
             line_id: line.id.clone(),
             text: line.text.clone(),
             speaker_entity_id: speaker_stable.0,
+            speaker_color_index: speaker_color,
+            speaker_name: speaker_display_name,
         });
 
         cooldown.record(&line.id, time.tick);