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/bridge_ipc.rs

@@ -60,6 +60,7 @@ fn snapshot_roundtrip_over_unix_socket() {
             pending_recognitions: vec![],
             dialogue_response: None,
             blocked_entities: vec![],
+            scan_events: vec![],
         };
 
         bridge