A Petri run executes in the worker process, which resolves the
sandbox-driver plugins itself. The `PETRI_SANDBOX_*` variables (plugin
paths, checksum overrides, dev mode, the Docker host address and the action
host image) now have `EnvVars` names, cross the worker's environment
allowlist with `PATH`, and pass through the test harness's isolation so a
developer's plugin override reaches the servers tests start and the workers
those servers launch.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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