···2121- Each test file tests exactly one spec. Do not put tests for one spec into
2222 another spec's test file.
23232424+## Commit and PR conventions
2525+2626+Do not include any agent marketing material (e.g. "Generated with...",
2727+"Co-Authored-By: \<agent>") in commits, pull requests, issues, or comments.
2828+2429## Rendering invariants
25302631- The renderer MUST NOT perform IO. It produces bytes; the caller writes them.