feat: Add Auth0 SDK migration skill

[NandanPrabhu]

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Description

PR adds auth0 sdk migration skill to agent skills repo
Auth0 sdk migration skill helps developer to migrate specific Auth0 SDK to a new major version. Skill refers specifically migration guide associated to the major version of the SDK.

References

Include any links supporting this change such as a:

• GitHub Issue/PR number addressed or fixed
• Auth0 Community post
• StackOverflow post
• Support forum thread
• Related pull requests/issues from other repos

If there are no references, simply delete this section.

Testing

Describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

Please include any manual steps for testing end-to-end or functionality not covered by unit/integration tests.

Also include details of the environment this PR was developed in (language/platform/browser version).

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch

[github-actions]

✅ claudelint — All checks passed

Full report

Linting Claude plugins in: /home/runner/work/agent-skills/agent-skills


Summary:
  Errors:   0
  Warnings: 0

✓ All checks passed!

claudelint 0.3.6 · config · custom rules · run

[sanchitmehtagit]

Lets update it to swift specific structured migration skill with boundaries. and we should not refer MIGRATION_GUIDE.md in it