feat: checker_jeson_mor(), chess_jeson_mor(), and piecepack_jeson_mor()

[trevorld]

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.27%. Comparing base (115a238) to head (16d8eba).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage   99.26%   99.27%           
=======================================
  Files          33       33           
  Lines        4084     4125   +41     
=======================================
+ Hits         4054     4095   +41     
  Misses         30       30           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.