docs: add v2→v3 migration guide and document new v3 features
- v2→v3 breaking-change list: default mode flip, maxAttempts:5, deleteOn enum change (removed "failure"), schema migration for deadLetteredAt - Document enqueueMany() with example - Document per-job timeout (jobTimeout) with example - Add "Dead-letter Queue & Monitoring" section: dead event, stats(), purge() usage - Update options table: maxAttempts default, deleteOn clarification, new maxRetryDelay, staleTimeout, jobTimeout rows - Update feature bullets to reflect new capabilities
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Olivier Louvignes committed
6ba97b0d3cff028ba77f2202e9932cce2e59829a
Parent: fa4a922