ci: run the unit tests on pull requests

[seancdavis]

We have 53 test files and 1,129 tests behind npm test, but nothing was running them on a PR — .github/workflows/ only had release-please.yml, so the suite executed at publish time and nowhere else. Came up while reviewing #62, where 147 new lines of test had never run in CI.

• Adds .github/workflows/test.yml, running npm test on every pull request and on push to main
• Reuses the install steps the publish job already proves out: actions/checkout@v6, actions/setup-node@v6 on Node 24 with npm caching, then npm ci --no-audit
• Builds the report UI first. test/unit/reports/html.test.ts reads dist/report-ui/index.html, which is gitignored, so 29 tests fail on a clean checkout. The first run on this PR caught that — my local runs had only been passing because dist/ was left over from an earlier build
• Concurrency group cancels a run in flight when a new commit lands on the same ref

Tests only. Lint, typecheck, and format checks all have scripts already and could go in the same workflow later.

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• .github/workflows/test.yml

📝 Summary

Summary by CodeRabbit

• Tests
  • Added automated test checks for pull requests and updates to the main branch.
  • Tests run in a consistent Node.js environment with dependency caching for faster validation.
  • In-progress checks are canceled when newer checks start for the same branch or change.

Walkthrough

Adds a GitHub Actions test workflow for pull requests and pushes to main. The workflow cancels in-progress runs for the same ref, checks out the repository, configures Node 24 with npm caching, installs dependencies with npm ci --no-audit, and runs npm test.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: 🟡 Moderate · up to 9564a

The new test workflow should declare read-only token permissions and disable persisted checkout credentials before merge, preventing pull request code from receiving unnecessary authenticated Git access.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: running unit tests on pull requests.
Description check	✅ Passed	The description accurately explains the new test workflow, its triggers, setup steps, and concurrency behavior.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch seandavis/ci-run-unit-tests

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Actionable comments posted: 2

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Inline comments:
In @.github/workflows/test.yml:
- Line 18: Update the actions/checkout step to set persist-credentials to false,
preventing the checkout token from remaining available to subsequent
repository-controlled steps.
- Around line 14-16: Set least-privilege GITHUB_TOKEN permissions for the
workflow by declaring a top-level permissions block with contents read, ensuring
unspecified permissions are unavailable while preserving checkout and job
execution.

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• .github/workflows/test.yml

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