fix: use xml_escape() in Stream.pm instead of manual regex escaping

[toddr-bot]

Summary

Stream.pm's Start handler manually applied four regex substitutions to escape XML special characters in attribute values, duplicating the logic already available in Expat.pm::xml_escape(). Replaced the four manual regexes with a single $expat->xml_escape($val, '>', '"') call.

Fixes #280

Changes

• Replace 4 manual regex substitutions (lines 31-34) with one xml_escape() call
• Net change: -5 lines, +1 line

Test plan

• Existing t/stream_attr_escape.t covers ampersand, quote, and angle bracket escaping in Stream attribute values
• Full test suite passes (63 files, 727 tests)

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Generated by Kōan /fix

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Quality Report

Changes: 1 file changed, 1 insertion(+), 5 deletions(-)

Code scan: clean

Tests: passed (OK)

Branch hygiene: clean

Generated by Kōan post-mission quality pipeline

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.54%. Comparing base (ab2416c) to head (7a530f8).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
+ Coverage   76.40%   76.54%   +0.14%     
==========================================
  Files           1        1              
  Lines        1102     1113      +11     
  Branches      346      351       +5     
==========================================
+ Hits          842      852      +10     
  Misses         52       52              
- Partials      208      209       +1     

Flag	Coverage Δ
perl	76.54% <ø> (+0.14%)	⬆️
xs	76.54% <ø> (+0.14%)	⬆️

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