MatrixOne errors cross several package boundaries where callers add context with fmt.Errorf or combine…

MatrixOne errors cross several package boundaries where callers add context with fmt.Errorf or combine…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). IsMoErrCode must keep its current nil and direct-error semantics, then inspect both single-error wrapping and…