CCM-13080: Add MessageRequestSkipped event and fix schema refs (#120)

* - Add MessageRequestSkipped event schema for handling bypassed message requests
- Update print TTL sequence diagram to show configurable fallback wait time
- Remove unused/obsolete event schemas and documentation files
- Update schema_data references from generic base schema to specific schemas
- Improved event descriptions with business context
- Fix schema references to use correct event and data schema URLs

* Change MessageRequestFailed --> MessageRequestRejected due to event naming rules

Author: tdroza-nhs

README.md

@@ -9,16 +9,20 @@ architecture-beta
     group coreNotifier(cloud)[CoreNotifier]
     service meshDownloaded(aws:res-amazon-eventbridge-event)[PDMResourceAvailable Event]
     service sqs(logos:aws-sqs)[CoreNotifier Queue] in coreNotifier
+    service clientConfig(aws:res-aws-systems-manager-parameter-store)[Client Configuration] in coreNotifier
     service coreNotified(aws:res-amazon-eventbridge-event)[MessageRequestSubmitted Event]
-    service coreFailed(aws:res-amazon-eventbridge-event)[MessageRequestFailed Event]
+    service coreFailed(aws:res-amazon-eventbridge-event)[MessageRequestRejected Event]
+    service coreSkipped(aws:res-amazon-eventbridge-event)[MessageRequestSkipped Event]
     service notifier(logos:aws-lambda)[CoreNotifier] in coreNotifier
     service notify(server)[NHS Notify Core]
     junction j1
 
     meshDownloaded:R --> L:sqs
     sqs:R -->  L:notifier
+    clientConfig:B --> T:notifier
     notifier:B --> T:notify
-    notifier:R --> L:j1
-    j1:R -- L:coreNotified
+    notifier:R -- L:j1
+    j1:T --> L:coreNotified
+    j1:R -- L:coreSkipped
     j1:B --> L:coreFailed
 ```

docs/collections/_diagrams/c4code-core-notifier.md

@@ -8,13 +8,15 @@ description: PDM Upload
     group createTtl(cloud)[QueueAdder]
 
     service db(aws:arch-amazon-dynamodb)[ItemsWithTTL] in createTtl
+    service clientConfig(aws:res-aws-systems-manager-parameter-store)[Client Configuration] in createTtl
     service createLambda(logos:aws-lambda)[CreateTTL] in createTtl
     service queue(logos:aws-sqs)[SQS] in createTtl
     service storedEvent(aws:res-amazon-eventbridge-event)[MESHInboxMessageDownloaded event]
     service scheduledEvent(aws:res-amazon-eventbridge-event) [ItemEnqueued event]
 
     storedEvent:R --> L:queue
     queue:R --> L:createLambda
+    clientConfig:B --> T:createLambda
     createLambda:R --> L:db
-    createLambda:T --> L:scheduledEvent
+    createLambda:B --> L:scheduledEvent
 ```

docs/collections/_diagrams/c4code-printer-sendtoqueue.md

@@ -9,10 +9,13 @@ sequenceDiagram
   participant eb as Event Bridge
   participant sqs as SQS<br/>CreateTTLQueue
   participant createTTL as Lambda<br/>CreateTTL
+  participant ssm as SSM<br/>Parameter Store
   participant dynamo as DynamoDB
 
 
   eb ->> sqs: MESHInboxMessageDownloaded event
   sqs ->> createTTL:
-  createTTL ->> dynamo: Insert (24h TTL)
+  createTTL ->> ssm: Get FallbackWaitTime
+  ssm -->> createTTL:
+  createTTL ->> dynamo: Insert (FallbackWaitTime TTL)
 ```

docs/collections/_diagrams/sequence-create-print-ttl.md

@@ -4,7 +4,7 @@ type: uk.nhs.notify.digital.letters.mesh.inbox.message.downloaded.v1
 nice_name: MESHInboxMessageDownloaded
 service: MESH Services
 schema_envelope:  https://notify.nhs.uk/cloudevents/schemas/digital-letters/2025-10-draft/events/uk.nhs.notify.digital.letters.mesh.inbox.message.downloaded.v1.schema.json
-schema_data: https://notify.nhs.uk/cloudevents/schemas/digital-letters/2025-10-draft/data/digital-letter-base-data.schema.json
+schema_data: https://notify.nhs.uk/cloudevents/schemas/digital-letters/2025-10-draft/data/digital-letters-mesh-inbox-message-downloaded-data.schema.json
 ---
 
 This is an event.

docs/collections/_events/event-bus-timer-time-expired.md

@@ -4,7 +4,7 @@ type: uk.nhs.notify.digital.letters.mesh.inbox.message.received.v1
 nice_name: MESHInboxMessageReceived
 service: MESH Services
 schema_envelope:  https://notify.nhs.uk/cloudevents/schemas/digital-letters/2025-10-draft/events/uk.nhs.notify.digital.letters.mesh.inbox.message.received.v1.schema.json
-schema_data: https://notify.nhs.uk/cloudevents/schemas/digital-letters/2025-10-draft/data/digital-letter-base-data.schema.json
+schema_data: https://notify.nhs.uk/cloudevents/schemas/digital-letters/2025-10-draft/data/digital-letters-mesh-inbox-message-received-data.schema.json
 ---
 
 This is an event.