`slicec` Diagnostic Refactoring#772

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InsertCreativityHere wants to merge 5 commits intoicerpc:mainfrom

InsertCreativityHere:big-diagnostic-refactoring

Commits on Apr 15, 2026

Did everything except for the emitter so far.
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Commits on Apr 16, 2026

Finished the refactoring portion.
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Commits on Apr 20, 2026