feat(cli): set the default hnsw:M value to 64

[Davidyz]

This should help mitigate (though may not fully fix) #24.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.27%. Comparing base (20b8553) to head (5eeb81f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #161   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files          22       22           
  Lines        1513     1513           
=======================================
  Hits         1502     1502           
  Misses         11       11           

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