Kotlin codegen always creates new label for variables assignments

The code generator should only create a new label if it encounters a variable declaration, not when it just sees a variable assignment.

The code in question is here https://github.com/d409f19/cellmata/blob/master/compiler/src/main/kotlin/visitors/codegen.kt#L748:L752

Open compiler/src/main/kotlin/visitors/codegen.kt at lines 748-752 and inspect how the code generator handles variable declarations versus assignments. Confirm that labels are created only for declarations, then verify that an assignment reuses the existing behavior without introducing a new label.

Written by the indexing model from the issue text.