docs: add missing i18n:schema command to CONTRIBUTING.md

[serhalp]

🔗 Linked issue

N/A

🧭 Context

I added this command a couple weeks ago, but didn't think to document it.

📚 Description

Document the command where the other i18n commands are documented

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Building	Preview, Comment	Mar 1, 2026 9:22pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ignored		Mar 1, 2026 9:22pm
npmx-lunaria	Ignored		Mar 1, 2026 9:22pm

[coderabbitai]

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ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3d0ae04 and 68c9e22.

📒 Files selected for processing (1)

• CONTRIBUTING.md

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📝 Walkthrough

Walkthrough

This change adds a new i18n command entry called i18n:schema to the documentation. The command generates a JSON Schema from the en.json locale file and outputs it to i18n/schema.json. This schema can be used for IDE validation and autocompletion when working with locale files that reference it. The modification involves a single line addition to the CONTRIBUTING.md file with no removals.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining that documentation for the i18n:schema command is being added to CONTRIBUTING.md where other i18n commands are documented.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch serhalp/docs-add-i18n-schema-cmd

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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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