feat(core): adds support for extendable message schemas based on the cloudevents spec

[dgoerdes]

No description provided.

[Copilot]

Pull request overview

This PR updates Nimbus message factories and base Zod schemas to support CloudEvents extension attributes (e.g., metadata, authcontext) while adding warnings for invalid extension attribute names per the CloudEvents spec.

Changes:

• Allow unknown/extension attributes to pass validation by switching base commandSchema / eventSchema / querySchema to loose objects.
• Extend createCommand / createEvent / createQuery inputs to accept extension attributes and pass them through to the created message.
• Add shared validation + new unit tests verifying extension passthrough and warning behavior.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
packages/eventsourcingdb/src/lib/eventMapping.ts	Adjusts typing for event creation to align with updated createEvent input typing.
packages/core/src/lib/message/message.ts	Introduces shared helper to warn on invalid CloudEvents extension attribute names.
packages/core/src/lib/message/command.ts	Enables extension attributes in schema + factory, and adds validation warnings.
packages/core/src/lib/message/command.test.ts	Adds tests for extension passthrough, validation, and warning behavior.
packages/core/src/lib/message/event.ts	Enables extension attributes in schema + factory, and adds validation warnings.
packages/core/src/lib/message/event.test.ts	Adds tests for extension passthrough, validation, and warning behavior.
packages/core/src/lib/message/query.ts	Enables extension attributes in schema + factory, and adds validation warnings.
packages/core/src/lib/message/query.test.ts	Adds tests for extension passthrough, validation, and warning behavior.
examples/eventsourcing-demo/src/write/iam/users/shell/http.ts	Demonstrates passing auth context as an extension attribute in HTTP example.
examples/eventsourcing-demo/src/write/iam/users/core/commands/inviteUser.command.ts	Demonstrates extending command schema with an auth context extension attribute.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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