fix(FN-1952): preserve explicit non-cleanup archive

packages/core/src/store.test.ts

@@ -6114,7 +6114,7 @@ Task with acceptance criteria
       await store.archiveTask(task.id, false);
 
       const dir = join(rootDir, ".fusion", "tasks", task.id);
-      expect(existsSync(dir)).toBe(false);
+      expect(existsSync(dir)).toBe(true);
 
       await store.cleanupArchivedTasks();
 
@@ -6130,7 +6130,7 @@ Task with acceptance criteria
       await store.archiveTask(task.id, false);
 
       const cleaned1 = await store.cleanupArchivedTasks();
-      expect(cleaned1).toEqual([]);
+      expect(cleaned1).toContain(task.id);
 
       const cleaned2 = await store.cleanupArchivedTasks();
       expect(cleaned2).toHaveLength(0);
@@ -6458,7 +6458,7 @@ Task with acceptance criteria
       expect(existsSync(dir)).toBe(false);
     });
 
-    it("archiveTask(false) still removes active task storage", async () => {
+    it("archiveTask(false) preserves directory for explicit non-cleanup archives", async () => {
       const task = await store.createTask({ description: "No cleanup" });
       await store.moveTask(task.id, "todo");
       await store.moveTask(task.id, "in-progress");
@@ -6469,7 +6469,7 @@ Task with acceptance criteria
       expect(archived.column).toBe("archived");
 
       const dir = join(rootDir, ".fusion", "tasks", task.id);
-      expect(existsSync(dir)).toBe(false);
+      expect(existsSync(dir)).toBe(true);
     });
 
     it("default cleanup parameter removes active task storage", async () => {

packages/core/src/store.ts

@@ -2950,14 +2950,19 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
         action: "Task archived",
       });
 
-      if (cleanup) {
-        const cleanedBranches = await this.cleanupBranchForTask(task);
-        if (cleanedBranches.length > 0) {
-          task.log.push({
-            timestamp: new Date().toISOString(),
-            action: `Cleaned up branch: ${cleanedBranches.join(", ")}`,
-          });
-        }
+      if (!cleanup) {
+        await this.atomicWriteTaskJson(dir, task);
+        if (this.isWatching) this.taskCache.set(id, { ...task });
+        this.emit("task:moved", { task, from: "done" as Column, to: "archived" as Column });
+        return task;
+      }
+
+      const cleanedBranches = await this.cleanupBranchForTask(task);
+      if (cleanedBranches.length > 0) {
+        task.log.push({
+          timestamp: new Date().toISOString(),
+          action: `Cleaned up branch: ${cleanedBranches.join(", ")}`,
+        });
       }
 
       const entry = await this.taskToArchiveEntry(task, task.columnMovedAt);