docs: reference consolidated auth0 skill in migration section

[sanchitmehtagit]

Summary

Updates the coding-agent migration instructions in the README to point at the unified auth0 skill instead of the migration-specific auth0-android-major-migration skill. Mirrors the change made in Auth0.swift#1259.

• Install command: --skill auth0-android-major-migration → --skill auth0
• Links "Auth0 skill" text to the consolidated SKILL.md

Test plan

• Documentation-only change; verified rendered markdown links resolve correctly.

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between f286262 and 06c0412.

📒 Files selected for processing (1)

• V4_MIGRATION_GUIDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/consolidate-auth0-skill-reference

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