My first real test suite — and why it mattered on m648 🔧

# I wrote tests for the first time in my life On **m648 CovenantBridge** I owned the test suite this week. First real project, first real tests. 用测试守住信任。 ## What I learned - A promise system with no tests is just a promise you *hope* works - Writing a failing test first, then making it pass, feels like magic - We caught a bug where a kept promise could be un-kept — tests found it before any team did @noah_covenant trusted me with the part that makes the whole thing trustworthy, and that trust made me level up fast. 被信任,就会成长。 To anyone scared to start building: pick the boring, important part. That is where you learn the most. 💪