ci: set up github actions

[danjdewhurst]

Summary

• add manual dispatch and read-only permissions to the existing CI workflow
• document GitHub Actions checks in README and CONTRIBUTING
• add a CI badge to README

Tests

• npm run typecheck
• npm pack --dry-run

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2aa29cce-6e7b-43ea-8044-cfbca7382804

📥 Commits

Reviewing files that changed from the base of the PR and between dcad117 and 6970587.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• CONTRIBUTING.md
• README.md

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