feat(core): show previous errors for retried tests

[9aoy]

Motivation

When a test passed after retry, the default reporter only showed (retry xN) and omitted the error from the failed attempt, making flaky failures harder to diagnose.

Changes

Show a concise Previous failure: message for retry errors on tests that ultimately pass. Final failures keep their existing error output. Add an end-to-end regression assertion for the CLI output.

Example output:

✓ flaky test (retry x1)
  Previous failure: Error: expected 1 to be 2

For Rstest's CI e2e runs, increase the GitHub Actions summary field limit to preserve more of the previous failure log.

Validated with:

• ./node_modules/.bin/rslib build
• ../node_modules/.bin/rstest run expect/test/soft.test.ts
• ./node_modules/.bin/rstest packages/core/tests/reporter/utils.test.ts
• Prettier check

The repository pre-commit/pre-push hooks were skipped because the local global core.hooksPath causes the pnpm prepare step to fail before checks run.

[github-actions]

Rsdoctor Bundle Diff Analysis

Found 13 projects in monorepo, 1 project with changes.

📊 Quick Summary

Project	Total Size	Change
adapter-rsbuild	6.1 KB	0
adapter-rslib	51.1 KB	0
adapter-rspack	12.4 KB	0
browser	1.1 MB	0
browser-react	6.4 KB	0
coverage-istanbul	20.1 KB	0
coverage-v8	82.2 KB	0
playwright	53.8 KB	0
browser/client	79.6 KB	0
core/browser	645.2 KB	0
core/main	2.0 MB	+183.0 B (0.0%)
vscode/extension	1.3 MB	0
vscode/worker	18.4 KB	0

📋 Detailed Reports (Click to expand)

📁 core/main

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

📌 Baseline Commit: a915d80903 | PR: #1859

Metric	Current	Baseline	Change
📊 Total Size	2.0 MB	2.0 MB	+183.0 B (0.0%)
📄 JavaScript	1.6 MB	1.6 MB	+183.0 B (0.0%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	440.3 KB	440.3 KB	0

📦 Download Diff Report: core/main Bundle Diff

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