[codex] Add square utility

[khaliqgant]

Summary

• Add a pure square(n) helper in packages/factory-sdk/src/square.ts
• Add Vitest coverage for positive, negative, and zero inputs

Validation

• npx vitest run packages/factory-sdk/src/square.test.ts

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 9b4645f5-8f87-420e-b42b-259035d8810e

📥 Commits

Reviewing files that changed from the base of the PR and between de24cb3 and 4ddc51e.

📒 Files selected for processing (2)

• packages/factory-sdk/src/square.test.ts
• packages/factory-sdk/src/square.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ar-238-square

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[kjgbot]

Closing per factory close-never-merge policy: synthetic [factory-e2e] probe PR from fv2's post-soak experiment. Never merged. (Auto-close fix in flight as PR #280.)