This patch release fixes persistence for the engine throughput wall time metric added in 0.5.1.

- Fixed `engine_wall_time_ms` attachment so ShogiArena rebuilds the `GameRecord` payload instead of mutating cloned `MoveRecord` / `MoveEngineInfo` values returned by rshogi accessors.
- Tournament DB move rows now persist non-null `game_move.engine_wall_time_ms` values when the runner collected engine wall time samples.
- DB roundtrip restores `engine_wall_time_ms` through `MoveEngineInfo.extras`, and remote game record construction uses the same persistence path.
