Add package license metadata

[yanziwei]

Summary

• add MIT license metadata to the package manifest
• align npm metadata with the repository license

Verification

• npm view dub@latest name version license repository homepage bugs --json
• node -e "const p=require('./package.json'); if (p.license !== 'MIT') throw new Error('license mismatch'); console.log(p.name, p.version, p.license)"
• git diff --check
• npm pack --dry-run --ignore-scripts --json

Summary by CodeRabbit

• Chores
  • Updated the project license to MIT.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8e68a3e4-4f44-4c10-af60-242cf9e42fb5

📥 Commits

Reviewing files that changed from the base of the PR and between a58c2fd and cea21a4.

📒 Files selected for processing (1)

• package.json

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📝 Walkthrough

Walkthrough

This PR adds an MIT license field to package.json, updating the package metadata to declare the project's licensing terms.

Changes

Package Metadata

Layer / File(s)	Summary
License field package.json	The license field with value "MIT" is added to the package manifest.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A hoppy update, small and bright, 🐰
MIT license shining with light,
One field added, clean and free,
Open source for all to see!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly summarizes the main change: adding a license field to package.json.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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