Document deferred CAMARA validation warnings and hints (Sync26 - r4.4 commonalities) #65

Problem description

The current validation of the Predictive Connectivity Data API passes with warnings that should be addressed or formally tracked before release.

The current validation reports the following warnings:

• [P-015] CloudEvent type format is wrong
  • The subscription API does not define a named EventType schema. Instead, the CloudEvent type value is defined inline.
  • Current recommendation from Commonalities is to define a dedicated event type schema (for example ApiEventType) using allOf, following the implicit-events template.
• [S-035] Notification must use application/cloudevents+json
  • The notification callback currently defines application/json instead of the required application/cloudevents+json.

The validation also reports several S-313 hints for free-form string fields. These are considered acceptable implementation-dependent fields and do not require changes.

Expected behavior

Update the API specification to align with the current CAMARA/Commonalities recommendations by:

• Defining a dedicated EventType schema for CloudEvents instead of inlining the enum.
• Updating the notification callback media type to application/cloudevents+json.
• Keeping the existing free-form string fields unchanged, documenting that the reported S-313 hints are expected and do not require action.

This should remove the current validation warnings while maintaining compatibility with the Commonalities CloudEvents guidance.

Additional context

Validation workflow: https://github.com/camaraproject/PredictiveConnectivityData/actions/runs/35985619432