docs(design): add user story knowledge bundle

design/user-stories/us-002-produce-standard-cloud-events.md

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+---
+type: User Story
+title: "US-002: Produce standard CloudEvents"
+description: Represent captured Minecraft activity as consistently identifiable CloudEvents 1.0 records.
+status: done
+---
+
+# US-002: Produce standard CloudEvents
+
+As an **event consumer**, I want Minecraft activity represented by a consistent CloudEvents envelope so that I can process records from multiple servers and players reliably.
+
+## Acceptance criteria
+
+- [x] Every record is a structured CloudEvents 1.0 JSON object with a unique stable event ID, UTC time, source, type, and JSON content type.
+- [x] Event types use the `games.dmg.minecraft.*` namespace.
+- [x] Every event includes the stable server ID, server name, and game version as extensions and in its data.
+- [x] Player events include the player UUID as an extension and include the player UUID and current name in their data.
+- [x] An event retains the same ID and payload while it is retried from the outbox.
+
+## Related
+
+- [US-001: Configure the event producer](us-001-configure-event-producer.md)
+- [US-003: Capture player and server activity](us-003-capture-player-activity.md)
+- [US-004: Capture periodic player snapshots](us-004-capture-player-snapshots.md)
+- [Event reference](../../README.md#events)