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Pull Request Overview

This PR refactors the SmallerThan method in FileBinlogCoordinates to use numeric file number comparison instead of lexicographic string comparison, fixing a bug where binlog file comparisons would fail when file numbers transitioned from 6 digits to 7 digits (e.g., "mysql-bin.999999" vs "mysql-bin.1000000").

• Replaced string comparison with FileNumberDistance method for accurate numeric comparison
• Removed unused FileSmallerThan method
• Added test coverage for edge cases including zero-padded transitions and same-file position comparisons

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
go/mysql/binlog_file.go	Refactored SmallerThan to use numeric file comparison via FileNumberDistance; removed unused FileSmallerThan method
go/mysql/binlog_file_test.go	Added tests for binlog file number transitions and same-file position comparisons

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