fix: use package license for skills

[maxchang3]

🔗 Linked issue

resolves #2043

🧭 Context

Currently, the logic for retrieving a skill’s license only checks the frontmatter.

As a result, when a skill does not specify a license there, the system displays a misleading "No license specified" warning, even if the parent package already defines a valid license.

📚 Description

This PR improves license handling in skills.ts by retrieving and passing the package license as a fallback when a skill does not specify its own license.

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(A related question: if a skill's license differs from the package's license, should we explicitly surface this (or even treat it as a warning)?)

[vercel]

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Mar 12, 2026 2:13pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The validateSkill function in server/utils/skills.ts was modified to accept an optional packageLicense parameter. The fetchSkillsList function now retrieves the package license from npm for the specified version. When constructing a SkillListItem, the license field prioritises frontmatter.license, then falls back to packageLicense. License-based warnings are only triggered when neither source provides a license. In-code comments were added to document the fallback logic.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The code changes directly address issue #2043 by implementing package license fallback logic in validateSkill and fetchSkillsList, preventing misleading 'No license specified' warnings.
Out of Scope Changes check	✅ Passed	All changes in server/utils/skills.ts are directly related to resolving license fallback handling for skills, with no unrelated modifications present.
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining the problem (license warnings despite package-level licenses) and the solution (fallback to package license).

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