feat(test): add high-volume shell test and refine perf harness

[sripasg]

Summary

Refines the CPU performance test harness based on feedback and adds a new test scenario for high-volume shell output.

Details

• Added optional CPU usage assertion in assertWithinBaseline.
• Added heapUsed to PerfSnapshot to track memory alongside CPU metrics.
• Simulates a tool call generating 1M lines of output to verify CLI efficiency and memory stability.

Related Issues

Fixes #24866

How to Validate

npm run test:perf

Pre-Merge Checklist

• [NA] Updated relevant documentation and README (if needed)
• [✅] Added/updated tests (if needed)
• [NA] Noted breaking changes (if any)
• [✅] Validated on required platforms/methods:
  • [✅] MacOS
    • [✅] npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the performance testing framework by integrating memory usage tracking and introducing a dedicated test scenario for high-volume shell output. These changes aim to improve the robustness and efficiency of the CLI, ensuring stable performance even when processing large amounts of data.

Highlights

• Performance Test Harness Refinement: Refined the CPU performance test harness based on feedback.
• New Test Scenario: Added a new test scenario for high-volume shell output.
• CPU Usage Assertion: Added optional CPU usage assertion in assertWithinBaseline.
• Memory Tracking: Added heapUsed to PerfSnapshot to track memory alongside CPU metrics.
• CLI Efficiency Verification: Simulates a tool call generating 1M lines of output to verify CLI efficiency and memory stability.

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[github-actions]

Size Change: +3.85 kB (+0.01%)

Total Size: 34 MB

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[gemini-code-assist]

Code Review

This pull request introduces a new performance test scenario, 'high-volume-shell-output', which simulates a shell command generating one million lines of output. It also adds a heapUsed metric to the PerfSnapshot interface and includes it in the performance test results output. However, the current implementation of the heapUsed metric and the new test scenario are fundamentally flawed because they measure the resource usage of the test runner process rather than the CLI child process being tested. This makes the performance data misleading, especially for verifying the efficiency of the CLI's output handling. It is recommended to update the harness to capture metrics from the CLI's telemetry logs and to consider using Resident Set Size (RSS) for a more accurate representation of the tool's memory footprint.

[jacob314]

Approved but please address the use of any.