ci: remove security scanner action

[ryoppippi]

Remove Claude security scanner GitHub Actions workflow

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Summary by cubic

Removed the Claude security scanner GitHub Actions workflow to disable automated security reviews. PRs and issue comments will no longer trigger @claudecop or post review comments; the CLAUDE_API_KEY secret is no longer needed.

• Migration
  • Adopt an alternative scanner or run manual security checks.
  • Remove the CLAUDE_API_KEY from repository secrets.

^{Written for commit 0a35f3a. Summary will update automatically on new commits.}

[Copilot]

Pull request overview

This PR removes the Claude security scanner GitHub Actions workflow file entirely. The workflow previously performed automated security reviews on pull requests and could be triggered by comments.

• Complete removal of the .github/workflows/security.yml file
• Eliminates automated security scanning triggered on pull requests and issue comments
• No other files or documentation reference this workflow

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[cubic-dev-ai]

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