fix: extract _expat_options to remove duplication

[toddr-bot]

Summary

Both parse() and parse_start() contained an identical 3-line loop filtering $self keys through Non_Expat_Options to build @expat_options. Extracted to a shared private method _expat_options.

Fixes #279

Changes

• Added _expat_options() method that returns filtered key-value pairs using map/grep
• Replaced duplicated loops in both parse() and parse_start() with calls to _expat_options()
• Added t/expat_options_method.t with 4 tests covering filtering behavior and both call sites

Test plan

• make test passes all 731 tests across 64 files
• New test verifies Non_Expat_Options and Handlers are excluded from returned options
• New test verifies both parse() and parse_start() produce working parsers through the shared method

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Generated by Kōan /fix

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Quality Report

Changes: 3 files changed, 291 insertions(+), 78 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 (293728e).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
+ 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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