Add Context7 library configuration

[GitBib]

Summary

• Adds the context7.json configuration file to claim the pymkv2 library on context7.com, enabling improved documentation discovery and integration for developers using Context7-compatible tools.

Test plan

• Verify context7.json is valid JSON and contains the correct URL and public key

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.52%. Comparing base (64e43e0) to head (a5bb082).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #104   +/-   ##
=======================================
  Coverage   88.52%   88.52%           
=======================================
  Files          21       21           
  Lines        1290     1290           
=======================================
  Hits         1142     1142           
  Misses        148      148           

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