feat(cli): add newline delimiter option and fix crlf behavior

[pamburus]

Summary

Add a new newline delimiter option and fix the incorrect behavior of the crlf option.

Changes

• Add new --delimiter=newline option that automatically detects and matches either LF (\n) or CRLF (\r\n) line endings, whichever comes first
• Fix --delimiter=crlf to correctly match only the literal CRLF sequence (\r\n) instead of performing automatic newline detection
• Update documentation and help text to reflect the new option

⚠️ Breaking Change

The --delimiter=crlf option now strictly matches the \r\n sequence instead of detecting both LF and CRLF.

Migration

If you were using --delimiter=crlf and relied on it matching both \n and \r\n:

• Replace --delimiter=crlf with --delimiter=newline
• Or update the HL_DELIMITER environment variable from crlf to newline

Delimiter Options

Value	Description
auto	Auto-detect delimiter (default)
cr	Carriage return (\r)
lf	Line feed (\n)
crlf	Carriage return followed by line feed (\r\n)
newline	Either lf or crlf, whichever comes first
nul	Null character (\0)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.09%. Comparing base (96bb124) to head (a5d6d19).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1296   +/-   ##
=======================================
  Coverage   88.08%   88.09%           
=======================================
  Files          67       67           
  Lines       11594    11598    +4     
=======================================
+ Hits        10213    10217    +4     
  Misses       1381     1381           

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