Better cancel response handling and supplier cancel actions

[jakub-id]

No description provided.

[Copilot]

Pull request overview

Adds explicit “cancel rejected” handling to the returnables patron-request workflow so a supplier can reject a cancellation request and the requester can transition back to supplying.

Changes:

• Extend the returnables state model with a cancel-rejected event and split supplier cancel handling into accept-cancel / reject-cancel actions.
• Update supplier action/message capability lists to include reject-cancel and cancel-rejected.
• Update ISO18626 supplying-agency message handling and tests to recognize cancel responses that reject cancellation.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
misc/returnables.yaml	Updates the YAML source state model to include cancel rejection and rename cancel actions.
broker/patron_request/service/statemodels/returnables.json	Updates the embedded returnables state model JSON to match the new cancel rejection flow.
broker/patron_request/service/statemodel_capabilities.go	Adds new lender action/message-event constants and exposes them via capabilities.
broker/patron_request/service/message-handler.go	Interprets cancel-response messages that indicate cancellation rejection and adds contradiction detection.
broker/patron_request/service/action.go	Implements new lender actions for accepting/rejecting cancel via ISO18626 CancelResponse.
broker/patron_request/service/action_mapping_test.go	Adjusts expected action availability for CANCEL_REQUESTED.
broker/patron_request/service/statemodel_test.go	Extends capabilities assertions for new action/event.
broker/patron_request/service/message-handler_test.go	Adds/updates tests for cancel rejection + contradiction scenarios.
broker/patron_request/service/action_test.go	Adds tests to validate outgoing ISO18626 cancel-response contents for new actions.
broker/test/patron_request/api/api-handler_test.go	Updates API capability assertions for the new supplier action/event.

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