rm-hull / jasengo / 19395107662

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refactor: Improve parser result and combinator API

This commit improves API consistency and usability, particularly
around error handling and sequencing heterogeneous parsers.

*   Renamed the error field in `parser.Result` from `Err` to `Error`.
*   Added `Result.IsSuccess()` method and `State.Remaining()`.
*   Implemented generic `Sequence(...)` and `ToAny[T]` combinators
    for cleaner handling of heterogeneous parser chains.
*   Added `Letter()` parser for matching alphabetical runes.
*   Updated README examples to reflect new field access (`.Value`,
    `.Error`) and direct parser invocation syntax.

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