chore: add license field to package.json

[btea]

Description

refer to https://publint.dev/@doc-kit/core@1.0.0

Validation

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run node --run test and all tests passed.
• I have check code formatting with node --run format:check & node --run lint.
• I've covered new added functionality with unit tests if necessary.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
api-docs-tooling	Ready	Preview	Aug 15, 2026 5:50am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.37%. Comparing base (15b3f3e) to head (4863a27).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1039   +/-   ##
=======================================
  Coverage   89.37%   89.37%           
=======================================
  Files         203      203           
  Lines       18986    18986           
  Branches     1769     1769           
=======================================
  Hits        16968    16968           
  Misses       2011     2011           
  Partials        7        7           

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[bmuenzenmeyer]

https://www.npmjs.com/package/@doc-kit/core/v/1.0.0