Optional list syntax separators

[hanbings-agent]

Allows omitting trailing commas and using newlines as implicit separators for match arms, enum variants, struct fields (definitions and literals).

This enhances readability by reducing boilerplate in multi-line lists without altering semantics. The implementation includes robust parsing for match arms to prevent misinterpretation and handles macro-expanded tokens. Explicit commas remain mandatory for items on the same line.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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