I want lazy redun task result expressions to support Python item access through expr key and slicing…

I want lazy redun task result expressions to support Python item access through expr key and slicing…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Indexing should work for sequence positions and mapping keys: if a task returns "a", "b", "c" , using its result…