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/content_runtime.rs

@@ -142,9 +142,9 @@ fn content_runtime_boot_tick_10_snapshot() {
     barrier.wait();
 
     // Server thread must not have panicked
-    server_handle
-        .join()
-        .expect("server thread panicked — content triggered a runtime error during tick processing");
+    server_handle.join().expect(
+        "server thread panicked — content triggered a runtime error during tick processing",
+    );
 
     // Validate final snapshot
     let snapshot = last_snapshot.expect("should have received at least one snapshot");