bump to v29.0.0-rc.18

[s5suzuki]

• add new constructors
• update default features
• rm LinkBuilder
• bump to v29.0.0-rc.18
• excl examples from cov
• add tests for boxed link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e11f2b9) to head (14a3b03).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #208   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          163       163           
  Lines        12286     12301   +15     
=========================================
+ Hits         12286     12301   +15     

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