relative: accept hence after a relative time

[ddy314]

Accept hence after a relative unit without reversing its sign, including fractional seconds. Tests cover case folding, signed and zero amounts, implicit amounts, ordinals, and invalid suffixes.

Refs uutils/coreutils#14683; coreutils will need a release/dependency update to receive this parser fix.

Validation: 416 tests and 2 doctests passed; Clippy and rustfmt passed.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (fdd87ce) to head (7dcf044).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #331      +/-   ##
==========================================
+ Coverage   97.47%   97.48%   +0.01%     
==========================================
  Files          21       21              
  Lines        4237     4258      +21     
  Branches      136      136              
==========================================
+ Hits         4130     4151      +21     
  Misses        106      106              
  Partials        1        1              

Flag	Coverage Δ
macos_latest	97.48% <100.00%> (+0.01%)	⬆️
ubuntu_latest	97.48% <100.00%> (+0.01%)	⬆️
windows_latest	12.16% <24.00%> (-0.02%)	⬇️

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Open (1)

• The parser result now represents both ago and hence (as well as the omitted suffix), but the… · New

What changed in this PR

This PR extends relative datetime parsing to accept hence as a future-oriented suffix while preserving explicit signs, including fractional seconds.

Changes:

• Replaces the optional ago parser with a direction parser supporting both ago and hence.
• Updates the relative-date grammar and README documentation.
• Adds tests covering suffix case folding, signed and fractional amounts, implicit amounts, ordinals, and invalid suffixes.

File	Description
src/​lib.rs	Adds coverage for hence parsing and invalid suffixes.
src/​items/​relative.rs	Parses ago and hence suffixes while applying the correct sign.
src/​items/​mod.rs	Updates the relative-date grammar documentation.
README.md	Documents hence as the future-relative suffix.

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