durable-background-jobslisted

# Durable Background Jobs Use only after the active phase identifies a job-specific decision. Inherit its authority, artifact, review, proof, output, and completion contract; do not select design, implementation, diagnosis, or operation mode here. Core invariant: a lease is expiring permission to attempt work, never proof of exclusive execution. One logical job and business-effect identity must converge across overlapping attempts, crashes, and lost acknowledgements. Load one branch: - acceptance, identities, lease, transition, or effect contract -> [contract.md](references/contract.md); - database-backed claims and transitions -> [database-backed.md](references/database-backed.md); - visibility timeout and acknowledgement queues -> [visibility-queue.md](references/visibility-queue.md); - durable workflow engine history and replay -> [durable-engine.md](references/durable-engine.md); - fairness, schedules, checkpoints, cancellation, drain, or retention -> [operations.md](references/operations.md).