Saving code in function pattern editor does not update steps

[popjell]

If you paste code into the function pattern code editor and save it, it will not update what you have and revert to what was there before.

[trissim]

Verified fixed on current main. Function editor changes are wired directly to DualEditorFunctionPatternController, which applies the normalized function spec through ObjectStateEditSession; the save path reconstructs the FunctionStep from that live ObjectState. Draft PR #99 adds a focused regression proving the edited callable reaches the reconstructed saved step and invalidates the compiled artifact plan.

Closing as completed.