chore: enable CodeQL code scanning

[isamu]

Summary

• Enable CodeQL code scanning with GitHub Actions v3
• Scans JavaScript/TypeScript on push, PR, and weekly schedule

Test plan

• CodeQL analysis completes successfully

🤖 Generated with Claude Code

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/enable-codeql

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[isamu]

Default setup already enabled. Workflow file conflicts with it.