fix(core): include coverage config in build cache digest

[9aoy]

Summary

Background

Persistent build cache entries created without coverage instrumentation could be reused for coverage runs, causing empty coverage data.

Implementation

• Add coverage state and provider to the Rstest build cache digest.
• Preserve user-provided cache digest values when normalized project cache config is re-normalized.
• Cover disabled coverage, default Istanbul, and custom provider digest cases.

User Impact

Coverage runs with build cache enabled no longer reuse incompatible non-coverage or different-provider bundles.

Related Links

None

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	3.6 KB	0
adapter-rslib	24.6 KB	0
adapter-rspack	7.7 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	970.2 KB	0
core/loaders	869.0 B	0
core/main	1.6 MB	+516.0 B (0.0%)
vscode/extension	58.9 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: 9a875bdc95 | PR: #1241

Metric	Current	Baseline	Change
📊 Total Size	1.6 MB	1.6 MB	+516.0 B (0.0%)
📄 JavaScript	1.5 MB	1.5 MB	+516.0 B (0.0%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	79.2 KB	79.2 KB	0

📦 Download Diff Report: core/main Bundle Diff

Generated by Rsdoctor GitHub Action