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

crates/domain/tests/entities/job.rs

@@ -0,0 +1,53 @@
+use domain::entities::{Job, JobStatus, JobType};
+use domain::errors::DomainError;
+use domain::value_objects::StructuredData;
+
+#[test]
+fn job_lifecycle_success() {
+    let mut job = Job::new(JobType::ExtractMetadata, 5, StructuredData::new());
+    assert_eq!(job.status, JobStatus::Queued);
+
+    job.start().unwrap();
+    assert_eq!(job.status, JobStatus::Processing);
+    assert!(job.started_at.is_some());
+
+    job.complete(StructuredData::new());
+    assert_eq!(job.status, JobStatus::Completed);
+    assert!(job.result_data.is_some());
+    assert!(job.completed_at.is_some());
+}
+
+#[test]
+fn retry_on_failure() {
+    let mut job = Job::new(JobType::ScanDirectory, 1, StructuredData::new());
+    job.start().unwrap();
+
+    job.fail("timeout");
+    assert_eq!(job.status, JobStatus::Queued);
+    assert_eq!(job.retry_count, 1);
+    assert!(job.can_retry());
+    assert!(job.started_at.is_none());
+}
+
+#[test]
+fn fails_after_max_retries() {
+    let mut job = Job::new(JobType::ScanDirectory, 1, StructuredData::new());
+    job.max_retries = 2;
+
+    job.start().unwrap();
+    job.fail("err1");
+    assert_eq!(job.status, JobStatus::Queued);
+
+    job.start().unwrap();
+    job.fail("err2");
+    assert_eq!(job.status, JobStatus::Failed);
+    assert!(!job.can_retry());
+}
+
+#[test]
+fn cannot_start_from_processing() {
+    let mut job = Job::new(JobType::ScanDirectory, 1, StructuredData::new());
+    job.start().unwrap();
+    let result = job.start();
+    assert!(matches!(result, Err(DomainError::Conflict(_))));
+}