release: v6.0.0

[mckalexee]

Summary

• Promote 6.0.0-alpha.0 to stable 6.0.0. No library behavior change vs. the alpha.
• CHANGELOG: close out [Unreleased] as [6.0.0] - 2026-04-20, note the typedoc regen and actions/checkout + actions/setup-node v4→v6 bump as the only delta from alpha.0, open a fresh [Unreleased], update compare links.
• package.json version → 6.0.0.

Test plan

• CI green (lint, format:check, typecheck, build, tests on Node 20/22/24 against DynamoDB Local)
• After merge: git tag v6.0.0 && git push origin v6.0.0 — publish workflow handles npm (latest dist-tag) + GitHub Release sourced from the CHANGELOG section

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.52%. Comparing base (b47f6e6) to head (39d55f0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   87.52%   87.52%           
=======================================
  Files          13       13           
  Lines         465      465           
  Branches       92       92           
=======================================
  Hits          407      407           
  Misses         32       32           
  Partials       26       26           

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