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>