fix: export MetadataEntry types from @doc-kit/core

[btea]

Description

Add explicit exports map entries for the metadata types subpaths (./metadata/types and ./generators/metadata/types) pointing to types.d.ts. Previously, these paths only resolved through the ./* wildcard, which fails under bundler module resolution since an extensionless specifier can't resolve to a .d.ts file. This caused JSDoc import('@doc-kit/core/generators/metadata/types') type annotations across the react/node packages to silently fail, leaving params typed as any.

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.

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Project	Deployment	Actions	Updated (UTC)
api-docs-tooling	Ready	Preview	Aug 15, 2026 3:09pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.46%. Comparing base (15b3f3e) to head (e5c70e0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1040      +/-   ##
==========================================
+ Coverage   89.37%   89.46%   +0.09%     
==========================================
  Files         203      203              
  Lines       18986    19039      +53     
  Branches     1769     1782      +13     
==========================================
+ Hits        16968    17033      +65     
+ Misses       2011     1999      -12     
  Partials        7        7              

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