perf(cli): remove process title startup overhead

[chenjiahan]

Summary

This PR removes the Rstest CLI startup code that updates process.title. Updating the process title is a synchronous native operation and adds measurable overhead for short-lived CLI commands, while the title is not required for CLI correctness.

The equivalent Rsbuild change improved rsbuild build by 18.501 ms mean time in a 30-run react-1k benchmark and by 10.018 ms mean time in an 80-run benchmark.

Related Links

web-infra-dev/rsbuild#7657
nodejs/node#59678

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[Copilot]

Pull request overview

Removes the process.title = 'rstest-node' assignment from the CLI entry to eliminate measurable startup overhead, mirroring an equivalent Rsbuild change.

Changes:

• Drop the process.title assignment and its comment in runCLI.

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[github-actions]

Rsdoctor Bundle Diff Analysis

Found 12 projects in monorepo, 1 project with changes.

📊 Quick Summary

Project	Total Size	Change
adapter-rsbuild	3.7 KB	0
adapter-rslib	24.7 KB	0
adapter-rspack	7.8 KB	0
browser	2.0 MB	0
browser-react	3.7 KB	0
browser-ui	803.5 KB	0
coverage-istanbul	9.6 KB	0
core/browser	970.0 KB	0
core/loaders	869.0 B	0
core/main	1.7 MB	-35.0 B (-0.0%)
vscode/extension	26.9 MB	0
vscode/worker	14.4 KB	0

📋 Detailed Reports (Click to expand)

📁 core/main

Path: packages/core/.rsdoctor/main/rsdoctor-data.json

📌 Baseline Commit: 2690a8bbe3 | PR: #1265

Metric	Current	Baseline	Change
📊 Total Size	1.7 MB	1.7 MB	-35.0 B (-0.0%)
📄 JavaScript	1.6 MB	1.6 MB	-35.0 B (-0.0%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	81.6 KB	81.6 KB	0

📦 Download Diff Report: core/main Bundle Diff

Generated by Rsdoctor GitHub Action