fix: don't lock base path at grep and rg Curators

[kuuote]

Currently base is accidentually permanent state. I'll fix it.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 50.63%. Comparing base (87e42ff) to head (3a85e0d).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
builtin/curator/grep.ts	0.00%	1 Missing ⚠️
builtin/curator/rg.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   50.59%   50.63%   +0.04%     
==========================================
  Files          77       77              
  Lines        2279     2277       -2     
  Branches       67       67              
==========================================
  Hits         1153     1153              
+ Misses       1126     1124       -2     

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