Workflow 2.4.6

Fixes an unnecessary task-to-run database lookup when compatibility resolution receives an explicit run with a null marker. The supplied run remains authoritative, which also avoids a Laravel lazy-loading violation in that path.

Task-marker precedence and the relationship fallback when no run is supplied are preserved. No schema or worker protocol changes are required.

Thanks to @vanducng for the report, fix and regression tests.

Details: #636