test(simulation): cross-room transition scenarios T1-T8 + test suite expansion (#506)

Cross-room transition tests (server/tests/cross_room_transitions.rs):
- T1: sprint suppresses interaction buffer, restores on Walk (D-055)
- T2: CarriedBy survives room transition — no TilePosition leak (D-065)
- T3: pause mid-corridor discards movement, Unpause resumes (D-031)
- T4: KnowledgeGraph persists across player position change (D-041)
- T5: entity knowledge downgrades Direct→KnowsDetails on LOS exit (D-060)
- T6: eavesdrop cut immediately on first movement out of corner (D-071)
- T7: confrontation verb disappears on retreat beyond MID_RANGE=5 (D-057/D-070)
- T8: Sprint blocks eavesdrop accumulation, Careful enables it (D-055+D-071)

All 8 tests pass. Test suite grows from 545 → 563 (18 tests added across sprint).
Tests use direct ECS World + Schedule pattern; T3 uses full App + SimulationPlugin.

Test suite expansion:
- content_scaling.rs: max_npc_pack_behavioral_regression + stress tests (#513)
- golden/proof_room_tick_10.json: updated golden file for gauntlet world changes
- golden_suite.rs, serialization.rs, bridge_ipc.rs, bridge_tcp.rs: adapted to
  new world entity count and wire types
- gen_fixtures.rs, perf_bench.rs, content_runtime.rs: minor test adaptations

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

server/tests/serialization.rs

@@ -25,6 +25,7 @@ fn test_snapshot(tick: u64, entities: Vec<VisibleEntity>) -> ObserverSnapshot {
         pending_recognitions: vec![],
         dialogue_response: None,
         blocked_entities: vec![],
+        scan_events: vec![],
     }
 }
 
@@ -252,6 +253,7 @@ fn snapshot_v2_fields_roundtrip() {
         pending_recognitions: vec![],
         dialogue_response: None,
         blocked_entities: vec![],
+        scan_events: vec![],
     };
 
     let bytes = rmp_serde::to_vec_named(&snapshot).expect("serialize");
@@ -345,6 +347,7 @@ fn all_facing_direction_variants_roundtrip() {
             pending_recognitions: vec![],
             dialogue_response: None,
             blocked_entities: vec![],
+            scan_events: vec![],
         };
         let bytes = rmp_serde::to_vec_named(&snapshot).expect("serialize");
         let decoded: ObserverSnapshot = rmp_serde::from_slice(&bytes).expect("deserialize");
@@ -1040,18 +1043,16 @@ fn gdscript_generated_fixtures_deserialize() {
         let bytes = fs::read(&path).unwrap_or_else(|_| panic!("read fixture {}", name));
 
         if name.starts_with("input_batch") {
-            let inputs: Vec<PlayerInput> = rmp_serde::from_slice(&bytes).unwrap_or_else(|e| {
-                panic!("deserialize GDScript batch fixture {}: {}", name, e)
-            });
+            let inputs: Vec<PlayerInput> = rmp_serde::from_slice(&bytes)
+                .unwrap_or_else(|e| panic!("deserialize GDScript batch fixture {}: {}", name, e));
             assert!(
                 !inputs.is_empty(),
                 "batch fixture {} should not be empty",
                 name
             );
         } else if name.starts_with("input_") || name.starts_with("boundary_tick_") {
-            let input: PlayerInput = rmp_serde::from_slice(&bytes).unwrap_or_else(|e| {
-                panic!("deserialize GDScript input fixture {}: {}", name, e)
-            });
+            let input: PlayerInput = rmp_serde::from_slice(&bytes)
+                .unwrap_or_else(|e| panic!("deserialize GDScript input fixture {}: {}", name, e));
             // Verify specific fixtures for extra confidence
             match name.as_str() {
                 "input_move_north" => {
@@ -1078,10 +1079,7 @@ fn gdscript_generated_fixtures_deserialize() {
                     assert_eq!(input.tick, 65536, "int_32 asymmetry: tick=65536");
                 }
                 "boundary_tick_2147483647" => {
-                    assert_eq!(
-                        input.tick, 2147483647,
-                        "int_32 asymmetry: tick=2^31-1"
-                    );
+                    assert_eq!(input.tick, 2147483647, "int_32 asymmetry: tick=2^31-1");
                 }
                 _ => {} // Other fixtures: deserialization success is sufficient
             }