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Support dereferencing previously-defined variables in skel conditionals

Support dereferencing previously-defined variables in skel conditionals: a task in LegoFlow-SWE (Harbor dataset). The skel parser currently allows defining a variable and using it within a single conditional expression, but it does not support referencing a variable that was defined in an earlier…

The task

The skel parser currently allows defining a variable and using it within a single conditional expression, but it does **not** support referencing a variable that was defined in an earlier part of the same command. This makes it impossible to write selectors that cross‑reference multiple variable assignments.

Part of Lego-X/LegoFlow-SWE.