feat(simulation): sprint 12 server — tier system, sound events, KG access, line previewer

Implements 4 completed tickets + partial progress on 2 more:

- #93 Tier marker components (ActiveSim, BackgroundSim, StateSaved + TierPlugin)
- #138 Information tag schema (ObserverAccess enum in knowledge/types.rs)
- #124 Sound event system (SoundEventEmitter, SoundEventQueue, bridge wiring)
- #193 Line previewer CLI (line_preview binary with filter/explain/sequence modes)
- #94 Active tier simulation (in progress — With<ActiveSim> filters)
- #139 Component-level access control (in progress — filter_by_access)

Updates snapshot fixtures and test golden files for new sound_events field.

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

server/tests/bridge_ipc.rs

@@ -61,6 +61,7 @@ fn snapshot_roundtrip_over_unix_socket() {
             dialogue_response: None,
             blocked_entities: vec![],
             scan_events: vec![],
+            sound_events: vec![],
         };
 
         bridge

server/tests/bridge_tcp.rs

@@ -47,6 +47,7 @@ fn snapshot_roundtrip_over_tcp() {
             dialogue_response: None,
             blocked_entities: vec![],
             scan_events: vec![],
+            sound_events: vec![],
         };
 
         bridge

server/tests/gen_fixtures.rs

@@ -37,6 +37,7 @@ fn fixture_snapshot(tick: u64, entities: Vec<VisibleEntity>) -> ObserverSnapshot
         dialogue_response: None,
         blocked_entities: vec![],
         scan_events: vec![],
+        sound_events: vec![],
     }
 }
 
@@ -208,6 +209,7 @@ fn generate_msgpack_fixtures() {
         dialogue_response: None,
         blocked_entities: vec![],
         scan_events: vec![],
+        sound_events: vec![],
     };
     write_fixture(
         "snapshot_v2_full",

server/tests/golden/proof_room_tick_10.json

@@ -46,7 +46,7 @@
   "pending_recognitions": [
     {
       "entity_id": 1,
-      "remaining_ticks": 1,
+      "remaining_ticks": 2,
       "total_delay_ticks": 6,
       "x": 16.5,
       "y": 13.5,
@@ -65,8 +65,9 @@
   "player_inventory": [],
   "player_stance": "Sprint",
   "scan_events": [],
+  "sound_events": [],
   "tick": 8,
-  "version": 9,
+  "version": 10,
   "visible_tiles": [
     {
       "tile_kind": "Wall",

server/tests/serialization.rs

@@ -26,6 +26,7 @@ fn test_snapshot(tick: u64, entities: Vec<VisibleEntity>) -> ObserverSnapshot {
         dialogue_response: None,
         blocked_entities: vec![],
         scan_events: vec![],
+        sound_events: vec![],
     }
 }
 
@@ -254,6 +255,7 @@ fn snapshot_v2_fields_roundtrip() {
         dialogue_response: None,
         blocked_entities: vec![],
         scan_events: vec![],
+        sound_events: vec![],
     };
 
     let bytes = rmp_serde::to_vec_named(&snapshot).expect("serialize");
@@ -308,7 +310,7 @@ fn protocol_version_constant_matches_snapshot() {
     let snapshot = test_snapshot(0, vec![]);
     assert_eq!(snapshot.version, PROTOCOL_VERSION);
     assert_eq!(
-        PROTOCOL_VERSION, 9,
+        PROTOCOL_VERSION, 10,
         "bump this assertion when protocol version changes"
     );
 }
@@ -348,6 +350,7 @@ fn all_facing_direction_variants_roundtrip() {
             dialogue_response: None,
             blocked_entities: vec![],
             scan_events: vec![],
+            sound_events: vec![],
         };
         let bytes = rmp_serde::to_vec_named(&snapshot).expect("serialize");
         let decoded: ObserverSnapshot = rmp_serde::from_slice(&bytes).expect("deserialize");