type-ruby / t-ruby / 21278734649

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Add tuple rest element support (#44) (#50)

Add support for tuple rest elements using the syntax `[Type, *Type[]]`.
This allows tuples with variable-length trailing elements.

Features:
- New `TupleRestElement` IR node for rest elements
- Parser support for `*Type[]` and `*Array<Type>` syntax
- Validation: rest must be at end, only one rest allowed
- RBS fallback: converts to union array (RBS doesn't support tuple rest)
- LSP: tuple type completions and hover support

Example:
```ruby
def get_values(): [String, *Integer[]]
  ["header", 1, 2, 3]
end
```

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