chore: enforce conventional commits via commitlint and Husky

[frederikprijck]

Summary

• Installs husky, @commitlint/cli, and @commitlint/config-conventional as root dev dependencies with a prepare script so hooks auto-install after npm install
• Adds commitlint.config.js extending the conventional commits spec, with scope-enum (error) restricting scopes to auth0-fastify, auth0-fastify-api, ci, security, deps and scope-empty (warning) nudging contributors to include a scope
• Creates .husky/commit-msg hook to validate commit messages locally before they're committed
• Adds a commitlint CI job to .github/workflows/test.yml using wagoid/commitlint-github-action (pinned to SHA), running on pull_request events only

Test Plan

• Run npm install and verify .husky/commit-msg is present
• Try git commit with a bad message (e.g. bad message) — should be blocked with a commitlint error
• Try git commit with a valid message (e.g. feat(auth0-fastify): something) — should succeed
• Try git commit with an invalid scope (e.g. feat(unknown): something) — should be blocked
• Open a PR and verify the Commitlint CI job runs and passes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ea0617de-ef8e-4e5f-81c9-2181233c4741

📥 Commits

Reviewing files that changed from the base of the PR and between 3e40188 and b23a1a3.

📒 Files selected for processing (4)

• .github/workflows/test.yml
• .husky/commit-msg
• commitlint.config.js
• package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch worktree-coventional-commits

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