feat: go_connect6() and go_renju() (#62)

[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 (798e5a6) to head (b90483b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files          33       33           
  Lines        4125     4135   +10     
=======================================
+ Hits         4095     4105   +10     
  Misses         30       30           

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