Provision Service Bus queues, sessions and dead-letter handling

[carndog]

Outcome

Provision the messaging infrastructure needed to prove the pipeline while preserving operability and safe replay.

Acceptance criteria

• Define queues or subscriptions for price observations, trade signals, risk decisions, and execution intents
• Enable duplicate detection using application MessageId
• Use SessionId equal to InstrumentId where per-instrument FIFO ordering is required
• Configure bounded delivery attempts, lock duration, retention, and dead-letter behaviour
• Define dead-letter inspection and replay procedures
• Provision resources with Bicep and validate through what-if
• Emit queue depth, failure, retry, and dead-letter telemetry
• Document that Service Bus is a buffer, not the executor rate limiter