f6777b1488
Fixed two separate deadlock issues preventing job queue from processing multiple jobs sequentially: **Deadlock #1: JobQueue lock ordering violation** - Fixed _calculate_queue_positions() attempting to acquire _jobs_lock while already holding _queue_positions_lock - Implemented snapshot pattern to avoid nested lock acquisition - Updated submit_job() to properly separate lock acquisitions **Deadlock #2: JobRepository non-reentrant lock bug** - Fixed _flush_dirty_jobs_sync() trying to re-acquire _dirty_lock while already holding it (threading.Lock is not reentrant) - Removed redundant lock acquisition since caller already holds lock Additional improvements: - Added comprehensive lock ordering documentation to JobQueue class - Added detailed debug logging throughout job submission flow - Enabled DEBUG logging in API server for troubleshooting Testing: Successfully processed 3 consecutive jobs without hanging