docs: Warn that scopes action requires a pull_request context

[remyduthu]

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

[mergify]

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[Copilot]

Pull request overview

Adds a documentation caution to prevent users from running the scopes action outside of a pull request context, which would otherwise cause GitHub Actions workflow failures.

Changes:

• Document that the scopes action requires a pull request context.
• Provide a suggested if: guard for workflows that also run on push.

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Pull request has been modified.