feat: add CI test workflow and update badge

[wonderwomancode]

Summary

• Add CI test workflow calling shared alternatefutures/.github reusable workflow (with build-before-test: true)
• Update Tests badge in README to point to new workflow
• Existing thresholds (60/60/75/60) and test:coverage script unchanged

Closes #62

Depends on: alternatefutures/.github#16 (reusable workflow must merge first)

Test plan

• Run pnpm test:coverage locally — passes (existing)
• Verify CI workflow runs after .github reusable workflow is merged
• Check Tests badge renders on GitHub README

🤖 Generated with Claude Code

[github-actions]

⚠️ Deprecation Warning: The deny-licenses option is deprecated for possible removal in the next major release. For more information, see issue 997.

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 1 package(s) with unknown licenses.

See the Details below.

License Issues

.github/workflows/test.yml

Package	Version	License	Issue Type
alternatefutures/.github/.github/workflows/test.yml	main	Null	Unknown License

Denied Licenses:

AGPL-3.0

OpenSSF Scorecard

Package	Version	Score	Details
actions/alternatefutures/.github/.github/workflows/test.yml	main	Unknown	Unknown

Scanned Files

• .github/workflows/test.yml