Bootstrap a per-run test database (ensure, push schema, truncate, seed baselines, repair sequences), wire vitest/playwright globals, and gate schema push behind DB_PUSH. Serial test files share the one database.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
