Switch deploy workflow to npm trusted publishing

[bombillazo]

Summary

• Replace NPM_TOKEN secret-based auth with OIDC trusted publishing
• Add id-token: write permission for provenance signing
• Switch from pnpm publish to npm publish --provenance
• Remove manual .npmrc token configuration step

Setup required

After merging, configure trusted publishing on npmjs.com:

1. Go to package settings → Publishing access
2. Add trusted publisher: repo bombillazo/error-x, workflow deploy.yml, environment production
3. Remove the NPM_TOKEN secret from GitHub repo settings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (757f59d) to head (0a62207).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #26   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines         1160      1160           
  Branches       250       201   -49     
=========================================
  Hits          1160      1160           

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