Add break_on_hyphens support for text with escape sequences

[ps06756]

Summary

• Adds sequence-aware _split() override in SequenceTextWrapper to properly handle break_on_hyphens when text contains escape sequences
• Adds test coverage for break_on_hyphens parameter

Problem

When text had per-character escape sequences (e.g., each letter colored separately), the parent's _split() regex couldn't correctly identify hyphens as break points because escape sequences were mixed into the text.

Solution

The new _split() method:

1. Strips sequences to get the "logical" text
2. Calls the parent's _split() on stripped text to find break points
3. Maps those break points back to the original text with sequences intact

Fixes #329

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.13%. Comparing base (cee680f) to head (0e3b6d8).

Files with missing lines	Patch %	Lines
blessed/sequences.py	94.11%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #330      +/-   ##
==========================================
- Coverage   98.35%   98.13%   -0.22%     
==========================================
  Files          11       11              
  Lines        2491     2524      +33     
  Branches      438      410      -28     
==========================================
+ Hits         2450     2477      +27     
- Misses         31       34       +3     
- Partials       10       13       +3     

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[avylove]

We'll need conditional logic, either in the code or the test to account for the <= 3.9 behavior, whichever @jquast prefers

Not sure what's going on with the linting job, looks like an unrelated tox/docformater issue.

[jquast]

I think it is fine to mark test_break_on_hyphens as ignored for python 3.9 and earlier as previously suggested.

I think it is OK to provide this "improved" textwrap behavior with Terminal.wrap() on older versions of python, even if it does not exactly match textwrap.wrap() on that version -- In the same way that 3rd libraries bring "backports" or improves upon standard libraries.

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I'll look at the linting issue with another PR, there are a number of issues more than just docformatter with unexplained exit code 3, all other tools are skipped due to the 3.13/3.14 mixed environment requirement in a single tox execution not satisfied by container python:3.14 image, due to PyCQA/docformatter#327