B1CommonB2ChunkData

• Wrapper payload for the CommonB2 ("CDB2") save chunk. The chunk originally stored FB1GlobalCityMoveData alone,
  * so it could not carry other B2 global data. This wrapper lets the single chunk hold multiple global structures
  * (city move + city travel), and new structures can be added as fields. Old saves hold a raw FB1GlobalCityMoveData
  * without the wrapper; the CDB2 load gate in UB2SimulationSystem::LoadInternal detects old vs new by save version
  * and CBOR structure (old buffers lack the top-level 'GlobalCityMoveData' key) and converts old -> new. (BL-59215)

Property	Type	Description	Metadata
GlobalCityMoveData	FB1GlobalCityMoveData	Global city-move data (per-city state, Zoi move, and household move maps).
GlobalCityTravelData	FB1GlobalCityTravelData	Global city-travel state (in-progress flag, active travel, household UI carry buffer).