Complete transport health checks: all 7 remaining transports + IHealthCheck adapter

[jeremydmiller]

Summary

Completes wolverine#2400 by adding health check implementations for all remaining transports and an ASP.NET Core IHealthCheck adapter with startup grace period.

New health check implementations:

• RedisHealthCheck — IConnectionMultiplexer.IsConnected + StreamLengthAsync for broker queue depth
• NatsHealthCheck — NatsConnection.ServerInfo availability
• MqttHealthCheck — IManagedMqttClient.IsConnected (no queue depth — MQTT is pub/sub)
• PulsarHealthCheck — IPulsarClient initialization check
• SqsHealthCheck — IAmazonSQS.ListQueuesAsync probe + GetQueueAttributesAsync for queue depth
• AzureServiceBusHealthCheck — GetNamespacePropertiesAsync probe + GetQueueRuntimePropertiesAsync for depth
• KafkaHealthCheck — AdminClient.GetMetadata for broker connectivity

ASP.NET Core integration:

• WolverineTransportHealthCheckAdapter wraps WolverineTransportHealthCheck as IHealthCheck
• 30-second startup grace period prevents false Unhealthy reports during initialization

Wiring: Each transport's BuildHealthCheck() implemented and returns the transport-specific health check.

Transport coverage matrix

Transport	Connection Check	Queue Depth	Probe Type
RabbitMQ	ConnectionMonitor.IsConnected/IsBlocked	MessageCountAsync	Passive
Redis	IConnectionMultiplexer.IsConnected	StreamLengthAsync	Passive
NATS	ServerInfo availability	N/A (future: JetStream)	Passive
MQTT	IManagedMqttClient.IsConnected	N/A (pub/sub)	Passive
Pulsar	IPulsarClient != null	N/A	Passive
SQS	ListQueuesAsync probe	GetQueueAttributes	Active
Azure Service Bus	GetNamespaceProperties probe	GetQueueRuntimeProperties	Active
Kafka	AdminClient.GetMetadata	N/A (future: consumer lag)	Active

Test plan

• All 8 transport projects build with 0 errors
• Smoke tests inherited from TransportCompliance<T> pass for each transport:
  • can_collect_endpoint_health_snapshots_without_error
  • receiver_endpoint_health_includes_listeners
  • sender_endpoint_health_includes_senders
  • transport_health_check_does_not_throw
• WolverineTransportHealthCheckAdapter reports Healthy during grace period
• Active probes (SQS, ASB, Kafka) handle connection failures gracefully (return Unhealthy, not throw)

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