refactor(metadata-db): replace with append-only ledger#1880
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job_eventstable that logs every job lifecycle transition (SCHEDULED, RUNNING, COMPLETED, ERROR, FATAL, etc.). Retry counts are now derived from SCHEDULED event counts rather than a dedicatedjob_attemptstable, which is dropped in this migration.JobStatus::FailedRecoverable→ErrorandFailedFatal→Fatalso that both thejobsandjob_eventstables use the same canonicalERROR/FATALvalues. The migration backfills events from existing jobs and updates legacy status strings in thejobstable.