- Set up Vitest with 27 tests across 3 test suites
- relativeTime: edge cases, time buckets, future timestamps
- sessionDisplayName: labels, kinds, channels, UUID truncation
- messagesToMarkdown: roles, blocks, tool calls, system events
- Add test and test:watch npm scripts
- Add test step to CI workflow
- CI runs build + type check on Node 18/20/22 for push & PRs
- Add CI status, license, and Node.js version badges to README
- Replace placeholder screenshot with contribution note