Add Source metadata support to Mediator and Consumer descriptions

[PascalSenn]

No description provided.

[PascalSenn]

LGTM

[Copilot]

Pull request overview

This PR adds SourceMetadata propagation to various runtime Describe() outputs (messages, consumers, sagas, mediator handlers) so diagnostic/visualization descriptions can include declaration/source information, and updates/extends tests and snapshots accordingly.

Changes:

• Add SourceMetadata? Source to multiple *Description record types and populate it from configuration in Describe() implementations.
• Implement saga-consumer fallback behavior so Consumer.Describe() can use the saga’s source when the consumer has none.
• Add focused tests asserting Source is present when configured, and update existing snapshots to include "Source": null.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/Mocha/test/Mocha.Tests/MessageTypes/MessageTypeTests.cs	Adds a test for message type Describe() returning configured Source.
src/Mocha/test/Mocha.Tests/Consumers/ConsumerBehaviorTests.cs	Adds a test for consumer Describe() returning configured Source.
src/Mocha/test/Mocha.Tests/Consumers/snapshots/ConsumerBehaviorTests.Describe_Should_ReturnConsumerDescription_When_EventHandlerRegistered.snap	Updates snapshot to include Source: null.
src/Mocha/test/Mocha.Sagas.Tests/SagaInitializationTests.cs	Adds tests for saga Describe() source and saga-consumer source fallback.
src/Mocha/test/Mocha.Mediator.Tests/MediatorDescriptionTests.cs	Adds a test for mediator handler descriptions returning configured Source.
src/Mocha/test/Mocha.Mediator.Tests/snapshots/MediatorDescriptionTests.Describe_Should_ReturnMediatorDescription_When_HandlersRegistered.snap	Updates snapshot to include Source: null per handler.
src/Mocha/src/Mocha/Sagas/SagaEventListener.cs	Adds consumer description source fallback to saga source.
src/Mocha/src/Mocha/Sagas/Saga.cs	Adds saga description Source population from saga configuration.
src/Mocha/src/Mocha/MessageTypes/MessageType.cs	Adds message type description Source population.
src/Mocha/src/Mocha/Descriptions/SagaDescription.cs	Extends SagaDescription with Source.
src/Mocha/src/Mocha/Descriptions/MessageTypeDescription.cs	Extends MessageTypeDescription with Source.
src/Mocha/src/Mocha/Descriptions/ConsumerDescription.cs	Extends ConsumerDescription with Source.
src/Mocha/src/Mocha/Consumers/Implementations/BatchConsumer.cs	Adds Source to batch consumer description output.
src/Mocha/src/Mocha/Consumers/Consumer.cs	Adds Source to base consumer description output.
src/Mocha/src/Mocha.Mediator/Descriptions/MediatorHandlerDescription.cs	Extends MediatorHandlerDescription with Source.
src/Mocha/src/Mocha.Mediator/DependencyInjection/MediatorBuilder.cs	Populates mediator handler description Source from handler config.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.