Migrate Dokka to V2 mode

[twyatt]

Note

Low Risk
Build and CI-only documentation pipeline changes with no runtime or application logic impact.

Overview
Migrates API docs generation from Dokka’s legacy multi-module HTML task to Dokka v2.

The root Gradle build now registers each library module (collections, coroutines, functional, temporal, test, encoding) via the dokka(...) dependency API and relies on dokkaGenerate instead of dokkaHtmlMultiModule. The old task that redirected HTML output to build/gh-pages is removed in favor of Dokka v2’s default build/dokka/html layout.

The GitHub Pages workflow runs ./gradlew dokkaGenerate and deploys build/dokka/html, matching the new output path.

^{Reviewed by Cursor Bugbot for commit 4b5b439. Configure here.}

[github-actions]

Test Results

458 tests   447 ✅  6s ⏱️
 71 suites   11 💤
 71 files      0 ❌

Results for commit bca98e2.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.79%. Comparing base (c08779d) to head (bca98e2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #560   +/-   ##
=======================================
  Coverage   69.79%   69.79%           
=======================================
  Files           9        9           
  Lines          96       96           
  Branches        5        5           
=======================================
  Hits           67       67           
  Misses         26       26           
  Partials        3        3           

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