domain: add domain errors, events, and services module scaffold

crates/domain/src/errors.rs

@@ -6,8 +6,12 @@ pub enum DomainError {
     Conflict(String),
     #[error("Unauthorized: {0}")]
     Unauthorized(String),
+    #[error("Forbidden: {0}")]
+    Forbidden(String),
     #[error("Validation error: {0}")]
     Validation(String),
+    #[error("Quota exceeded: {0}")]
+    QuotaExceeded(String),
     #[error("Internal error: {0}")]
     Internal(String),
 }

crates/domain/src/events.rs

@@ -1,7 +1,49 @@
-use uuid::Uuid;
+use crate::value_objects::{DateTimeStamp, SystemId};
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
 pub enum DomainEvent {
-    UserRegistered { user_id: Uuid },
-    UserLoggedIn { user_id: Uuid },
+    AssetIngested {
+        asset_id: SystemId,
+        owner_user_id: SystemId,
+        timestamp: DateTimeStamp,
+    },
+    MetadataUpdated {
+        asset_id: SystemId,
+        updated_by: SystemId,
+        timestamp: DateTimeStamp,
+    },
+    AssetDeleted {
+        asset_id: SystemId,
+        deleted_by: SystemId,
+        timestamp: DateTimeStamp,
+    },
+    ShareCreated {
+        scope_id: SystemId,
+        shareable_id: SystemId,
+        created_by: SystemId,
+        timestamp: DateTimeStamp,
+    },
+    ShareRevoked {
+        scope_id: SystemId,
+        revoked_by: SystemId,
+        timestamp: DateTimeStamp,
+    },
+    SidecarSyncRequested {
+        asset_id: SystemId,
+        timestamp: DateTimeStamp,
+    },
+    JobEnqueued {
+        job_id: SystemId,
+        job_type: String,
+        timestamp: DateTimeStamp,
+    },
+    JobCompleted {
+        job_id: SystemId,
+        timestamp: DateTimeStamp,
+    },
+    JobFailed {
+        job_id: SystemId,
+        error: String,
+        timestamp: DateTimeStamp,
+    },
 }

crates/domain/src/lib.rs

@@ -2,4 +2,5 @@ pub mod entities;
 pub mod errors;
 pub mod events;
 pub mod ports;
+pub mod services;
 pub mod value_objects;

crates/domain/src/services/metadata_resolver.rs

@@ -0,0 +1 @@
+// Metadata resolver — will be implemented in Task 9

crates/domain/src/services/mod.rs

@@ -0,0 +1,3 @@
+pub mod metadata_resolver;
+pub mod permission_service;
+pub mod quota_checker;

crates/domain/src/services/permission_service.rs

@@ -0,0 +1 @@
+// Permission service — will be implemented in Task 5

crates/domain/src/services/quota_checker.rs

@@ -0,0 +1 @@
+// Quota checker — will be implemented in Task 7

crates/domain/tests/domain_tests.rs

@@ -1 +1,2 @@
+mod events;
 mod value_objects;

crates/domain/tests/events.rs

@@ -0,0 +1,14 @@
+use domain::events::DomainEvent;
+use domain::value_objects::{DateTimeStamp, SystemId};
+
+#[test]
+fn asset_ingested_serde_roundtrip() {
+    let event = DomainEvent::AssetIngested {
+        asset_id: SystemId::new(),
+        owner_user_id: SystemId::new(),
+        timestamp: DateTimeStamp::now(),
+    };
+    let json = serde_json::to_string(&event).unwrap();
+    let back: DomainEvent = serde_json::from_str(&json).unwrap();
+    assert!(matches!(back, DomainEvent::AssetIngested { .. }));
+}