#532 [API/Bug] workflows.py:2074 - run_id undefined in retry_workflow

File: api/blueprints/v1/workflows.py:2074. Variable run_id is referenced but never defined. Function will crash with NameError. The retry_workflow function creates workflow_run record but never spawns a task. IMPACT: 500 error on every retry_workflow call. FIX: Add spawn_task logic that defines run_id.