- Add RunClient for submitting runs to server with priority support (low, normal, high, critical)
- Implement --run-priority and --server-url CLI flags for server submission mode
- Add RunPriority and RunMode fields to database Run model for persistence
- Update CreateRunRequest with priority and run_mode validation
- Implement runServerSubmission() to submit workflows with priority to server API
- Comprehensive E2E tests for run endpoints with priority validation and multiple targets
- Add foreach-preprocess test workflow with variable_pre_process support
