[lolow]

Summary

• witch_translate_data() now also runs input/make_data_*.jl (after the R files, before the GAMS files) with julia --project=input, after instantiating that project. These files take the same -i, -w, -m, --noCheck options as the R scripts and write input/build/data_*.gdx. Same mtime-based skip logic as make_data_R.
• Fails early with a clear message if .jl files exist but julia is not in the PATH.
• Drop the call to the deprecated gdxtools::igdx() and require gdxtools >= 1.2.0.
• Bump to 0.7.0 with a NEWS entry.

Depends on lolow/gdxtools#24 (gdxtools 1.2.0). Part of the WITCH migration of the R make_data scripts to Julia (witch branch feat/make-data-julia).

Test plan

• testthat::test_local('.'): 399 passed, 0 failed
• End-to-end Rscript input/translate_witch_data.R on the WITCH branch once the Julia ports land

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