chore: Cleanups unrelated to context

[effigies]

Working on a replacement for #24, here are some things that would distract.

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.62%. Comparing base (7b8b72a) to head (a354d5a).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bids_validator/types/_typings.py	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
- Coverage   92.16%   91.62%   -0.54%     
==========================================
  Files           9       10       +1     
  Lines         434      442       +8     
  Branches       64       65       +1     
==========================================
+ Hits          400      405       +5     
- Misses         21       23       +2     
- Partials       13       14       +1     

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