NTFS does not allow < or > in filenames, causing the XML filename
escaping test to fail on Windows CI with ENOENT.
Replace file<test>.txt with file&test.txt — & is valid on all platforms
and still requires XML escaping (&), preserving the test's intent.
Fixes#3748
* fix: Prevent XML attribute injection by escaping special characters in file name and MIME type attributes.
* fix: text attachment MIME misclassification with security hardening (#3628)
- Fix CSV/TSV inference from content heuristics
- Add UTF-16 detection and BOM handling
- Add XML attribute escaping for file output (security)
- Add MIME override logging for auditability
- Add comprehensive test coverage for edge cases
Thanks @frankekn
