feat(simulation): character archetype, tell escalation, and news ticker (#587, #589, #591)

- Add character_archetype to StartupMessage with serde default (Detective)
- Bump PROTOCOL_VERSION to 19
- Add escalate_tells_on_activation() and expire_routine_deviations() systems
- RoutineDeviation inserted on triangle NPCs with 300-tick TTL
- Add TickerPool resource with deterministic SimRng rotation (200 ticks)
- Emit current_ticker in ObserverSnapshot when player is in bar zone
- Load ticker YAML from district content directories

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

server/src/content/loader.rs

@@ -30,6 +30,8 @@ pub struct DistrictContent {
     pub routines: Option<RoutineFile>,
     pub dialogue_pools: Vec<DialoguePool>,
     pub monologue_pools: Vec<MonologuePool>,
+    /// Ticker headlines loaded from `ticker/*.yaml` files (#591).
+    pub ticker_headlines: Vec<crate::content::types::TickerHeadline>,
 }
 
 /// Errors that can occur during content loading.
@@ -234,16 +236,32 @@ fn load_district(district_dir: &Path) -> Result<DistrictContent, ContentError> {
         content.monologue_pools = load_yaml_recursive::<MonologuePool>(&monologue_dir);
     }
 
+    // Ticker headlines (#591): scan ticker/*.yaml in this district
+    let ticker_dir = district_dir.join("ticker");
+    if ticker_dir.is_dir() {
+        let ticker_files = load_yaml_dir::<crate::content::types::TickerFile>(&ticker_dir);
+        for tf in ticker_files {
+            tracing::info!(
+                "Ticker loaded: {} headlines from '{}' (feed: {})",
+                tf.headlines.len(),
+                tf.location,
+                tf.feed,
+            );
+            content.ticker_headlines.extend(tf.headlines);
+        }
+    }
+
     let npc_count = content.npc_profiles.len();
     let triangle_count = content.triangles.len();
     let template_count = content.templates.len();
     let pool_count = content.pools.len();
     let dialogue_count = content.dialogue_pools.len();
     let monologue_count = content.monologue_pools.len();
+    let ticker_count = content.ticker_headlines.len();
 
     tracing::info!(
-        "District loaded: {} NPCs, {} triangles, {} templates, {} pools, {} dialogue pools, {} monologue pools",
-        npc_count, triangle_count, template_count, pool_count, dialogue_count, monologue_count
+        "District loaded: {} NPCs, {} triangles, {} templates, {} pools, {} dialogue pools, {} monologue pools, {} ticker headlines",
+        npc_count, triangle_count, template_count, pool_count, dialogue_count, monologue_count, ticker_count
     );
 
     Ok(content)