test: guard large table rendering

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Risky behavior now covered

renderTable can process 150,000 sessions without overflowing the JavaScript call stack and keeps every rendered row aligned when the widest value appears at the end of the input.

This guards merged PR #12's single-pass width calculation against regression to the former Math.max(...matrix) implementation, which throws RangeError: Maximum call stack size exceeded at this input size.

Test files updated

• test/format.test.ts

Why this materially reduces regression risk

The existing small fixtures and excluded benchmark both pass if the old spread-based implementation returns. The new deterministic test exercises the actual large-input failure mode without timing assertions or external dependencies. A mutation check confirmed that restoring the old implementation makes this test fail with the expected RangeError.

Validation

• npm test — 36/36 passed
• npm run build — passed
• npx prettier --check test/format.test.ts — passed

  

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Project	Deployment	Actions	Updated (UTC)
polyagent	Ready	Preview, Comment	Jul 21, 2026 10:08am