feat(parser): add ellipsis shorthand for incoming values

[Seddryck]

Summary

• allow a spread argument to omit its value
• interpret the omitted value as the existing ellipsis-at-underscore shorthand semantics
• add corpus coverage for array ellipsis and remove its invalid snapshot

Validation

• Focused Tree-sitter implicit incoming-value spread test passes
• Full Tree-sitter corpus: new case passes; seven unrelated existing CRLF snapshot mismatches remain on Windows
• npm dependency install reaches a pre-existing node-gyp Release-Win32 configuration error

Close #105

[coderabbitai]

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