Document features that exist but aren't in the docs

Handler outbox semantics (Outbox all handler-based message publications #224, Dispatch outbox using worker queue #225): what is buffered, when it is flushed, and the guarantees.
AWS Lambda receiver (@node-ts/bus-sqs-lambda, Receiver plugin for AWS Lambda serverless hosts #229) and bus.receive().
SQS autoProvision: false and the IAM permissions required (feat: Add ability to opt out of resouce auto provisioning when using sql transport #234, When auto provision bypass syncing attributes #235, SQS optimistic create causes a permission denied issue #233).
bus.returnMessage() (Expose bus.returnMessage() #226) and bus.failMessage().
Error handling and the dead-letter queue: where failed messages go, and how to replay them.
Testing handlers and workflows with the in-memory transport.
Deployment and scaling guidance: concurrency, multiple instances, graceful shutdown.

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