fix: sync package-lock.json root license with package.json

[jackgranatowski]

Summary

• Follow-up to the qodo-code-review findings on chore: relicense plugin from GPL-2.0-or-later to GPL-3.0-or-later #149.
• Verified 4 of 5 flagged findings were already fixed by f45ac7a (the scope-leak recovery commit): npm run check script, Gutenberg class-color-math.php include, SLASHED_*_CSS_REF version alignment, and composer phpunit script/dependency.
• Finding docs: trim and correct markdown to shipped reality #5 (stale package-lock.json metadata) was only partially fixed — the version field matched, but the root package's license field was still MIT while package.json had already been changed to GPL-3.0-or-later as part of the relicense. This PR corrects the lockfile's root license field to match.

Test plan

• npm test — 142/142 passing
• node scripts/verify-sync.js — all version metadata consistent
• Confirmed no other package-lock.json license entries were affected (only the root package block changed; dependency license fields are unrelated third-party packages)

🤖 Generated with Claude Code

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[qodo-code-review]

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