fix: ensure initial matching when -input= option is provided

[lambdalisue]

Summary

• Fixes an issue where the first matching was not executed when using the -input= option
• The root cause was that initialQuery was being set to #previousQuery, which prevented the matching logic from detecting a query change

Changes

• Set #previousQuery to undefined on initialization instead of initialQuery
• Added comment explaining why this is necessary for the -input= option to work correctly

Test plan

• Verify that providing -input= option triggers initial matching
• Verify that normal operation without -input= still works as expected

Notes

Recreated from main branch to ensure clean CI runs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.84%. Comparing base (abfe3b7) to head (cd1fd63).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #47   +/-   ##
=======================================
  Coverage   83.84%   83.84%           
=======================================
  Files          32       32           
  Lines        2024     2024           
  Branches      214      214           
=======================================
  Hits         1697     1697           
  Misses        324      324           
  Partials        3        3           

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