Add "Snyk: New vulnerabilities" check

[continue]

Adds the Snyk: New vulnerabilities check to this repository.

This check will be synced from .continue/checks/snyk-new-vulnerabilities.md and can be customized by editing the file directly.

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Opened via Continue Hub

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Summary by cubic

Adds a repository check “Snyk: New vulnerabilities” to guide triage and fixes when new Snyk issues are detected. The check is defined in .continue/checks/snyk-new-vulnerabilities.md and can be customized in that file.

• New Features
  • Uses continuedev/gh-pr-commit-workflow rules.
  • Includes step-by-step guidance and a draft PR template (title, fields, expandable Snyk details).
  • Embeds the Snyk webhook payload in the draft PR for quick context.

^{Written for commit 67ef7e2. Summary will update on new commits. Review in cubic}

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