Implement ifelse in DSL for for loops

[thorek1]

Summary

• handle ifelse and single-branch if constructs while expanding for loops
• test loops with if without an else

Testing

• Pkg.precompile() (fails: InterruptException)
• Pkg.test() (fails: Unsatisfiable requirements)

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https://chatgpt.com/codex/tasks/task_e_6840c104b2b8832fba8d139081a51108

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 36.36364% with 14 lines in your changes missing coverage. Please review.

Please upload report for BASE (rethink_parser@c24a819). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/MacroModelling.jl	36.36%	14 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             rethink_parser     #111   +/-   ##
=================================================
  Coverage                  ?   44.41%           
=================================================
  Files                     ?       18           
  Lines                     ?    10442           
  Branches                  ?        0           
=================================================
  Hits                      ?     4638           
  Misses                    ?     5804           
  Partials                  ?        0           

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