workdir: project occupancy from links

crates/worker-runtime/src/catalog.rs

@@ -138,6 +138,15 @@ pub struct WorkingDirectoryCleanupTarget {
     pub repository_id: String,
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct WorkingDirectoryOccupancy {
+    pub runtime_id: String,
+    pub runtime_worker_id: u64,
+    pub worker_id: String,
+    pub display_name: String,
+    pub linked_at: String,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct WorkingDirectorySummary {
     pub working_directory_id: String,
@@ -156,6 +165,8 @@ pub struct WorkingDirectorySummary {
     pub cleanliness: Option<String>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub primary_worker_id: Option<WorkerId>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub occupied_by: Option<WorkingDirectoryOccupancy>,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]

crates/worker-runtime/src/working_directory.rs

@@ -48,6 +48,7 @@ impl WorkingDirectory {
             status: self.status.clone(),
             cleanliness: None,
             primary_worker_id: None,
+            occupied_by: None,
         }
     }
 }
@@ -221,6 +222,7 @@ impl LocalGitWorktreeMaterializer {
                 status: WorkingDirectoryStatusKind::Corrupted,
                 cleanliness: Some("unknown".to_string()),
                 primary_worker_id: None,
+                occupied_by: None,
             },
         }
     }