domain: add Processing entities and ports (Job, JobBatch, Plugin, Pipeline)

crates/domain/tests/entities/job_batch.rs

@@ -0,0 +1,31 @@
+use domain::entities::{BatchStatus, JobBatch};
+
+#[test]
+fn completes_when_all_done() {
+    let mut batch = JobBatch::new("scan", 3);
+    batch.record_completion();
+    batch.record_completion();
+    batch.record_completion();
+    assert_eq!(batch.status, BatchStatus::Completed);
+}
+
+#[test]
+fn completes_with_errors() {
+    let mut batch = JobBatch::new("scan", 3);
+    batch.record_completion();
+    batch.record_failure();
+    batch.record_completion();
+    assert_eq!(batch.status, BatchStatus::CompletedWithErrors);
+}
+
+#[test]
+fn progress_tracking() {
+    let mut batch = JobBatch::new("scan", 4);
+    assert_eq!(batch.progress_percent(), 0.0);
+
+    batch.record_completion();
+    assert_eq!(batch.progress_percent(), 25.0);
+
+    batch.record_completion();
+    assert_eq!(batch.progress_percent(), 50.0);
+}