futpib / parser / 19989952286

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Rename instruction index fields to be explicit in public AST

Make branch offsets absolute and rename fields to clarify they are
instruction indices, not code unit offsets:

Bytecode operations (relative -> absolute):
- branchOffset -> targetInstructionIndex
- branchOffsets -> targetInstructionIndices

Try/catch blocks:
- startAddress -> startInstructionIndex
- address -> handlerInstructionIndex
- catchAllAddress -> catchAllInstructionIndex

The conversion functions now handle relative-to-absolute transformation
for branch offsets, making the Tier 3 AST more intuitive to use.

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