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ignore: improve file ignore performance and cross-platform support

- Replace glob patterns with Set lookup for common folders to speed up matching
- Use path.sep for cross-platform compatibility on Windows/Unix systems
- Add comprehensive test coverage for nested and non-nested folder matching
- Simplify implementation by removing unnecessary caching complexity
D
Dax Raad committed
dfc7ac4cf083eeeaa0cc8cabad21c1524b3903a2
Parent: c2950d2