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Priority queue with bounded per-tier concurrency in TypeScript on Resonate
A nested loop over priority tiers becomes the scheduler when every yield* is a durable Resonate checkpoint.
Process a batch of jobs in strict priority-tier order with up to 2 jobs running concurrently per tier. Each job is a durable checkpoint, so a mid-batch crash only retries the failing job — completed higher-priority jobs are not re-run.