Quality AssuranceΒΆ This section covers testing, CI, and common pitfalls. Read these before opening a PR. Common Integration Mistakes 1. Trusting Placeholders More Than Contracts 2. Train/Validation/Test Input Drift 3. Choosing the Wrong Path 4. Breaking Checkpoint Semantics in Custom Training 5. Adding data.py for the Wrong Reason 6. Shipping Without the Right Test Scope Quick Pre-PR Checklist Testing Checklist and CI Guide Environment Setup Understanding the Test Infrastructure Writing Tests for Your Model Minimum Required Checks When to Run Broader Regression CI and Lint What CI Checks Local Commands That Match CI Fast Triage Rules Review-Ready Evidence