fix(core): normalize mixed pool CLI options

[9aoy]

Summary

This PR fixes rstest --pool forks --pool.maxWorkers 1, which previously failed during CLI parsing because --pool set pool to a string before --pool.maxWorkers tried to write a nested property. The CLI now normalizes mixed pool shorthand and nested pool options to --pool.type before handing args to cac, matching the existing mixed coverage option behavior.

Checklist

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

[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	810.6 KB	0
coverage-istanbul	9.6 KB	0
core/browser	970.1 KB	0
core/loaders	869.0 B	0
core/main	1.7 MB	+419.0 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: 7938535556 | PR: #1286

Metric	Current	Baseline	Change
📊 Total Size	1.7 MB	1.7 MB	+419.0 B (0.0%)
📄 JavaScript	1.6 MB	1.6 MB	+419.0 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

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