fix(A.5 T13-T16): canonical LB id in Tick_DrainingPromoted test

Commit 19b4465's new ToPromote test pre-loaded an LB with a non-
canonical id (low 16 bits 0x0FFF instead of 0xFFFF). The new
canonicalization in AddEntitiesToExistingLandblock then key-missed and
parked the entity in the pending bucket instead of merging — assertion
failed.

Use canonical id 0x3232FFFFu directly. The test now exercises the
intended hot-path (merge into existing LB), not the cold pending-bucket
fallback (which is exercised by GpuWorldStateTwoTierTests).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/AcDream.Core.Tests/Streaming/StreamingControllerTwoTierTests.cs

@@ -92,7 +92,9 @@ public class StreamingControllerTwoTierTests
         var state = new GpuWorldState();
 
         // Pre-load a far-tier-style LB record (terrain only, no entities).
-        uint lbId = 0x32320FFFu;
+        // Id must be in canonical form (low 16 bits = 0xFFFF) since
+        // AddEntitiesToExistingLandblock canonicalizes incoming ids.
+        uint lbId = 0x3232FFFFu;
         var lb = new LoadedLandblock(lbId, Heightmap: null!, Entities: System.Array.Empty<WorldEntity>());
         state.AddLandblock(lb);
         Assert.Empty(state.Entities);